Answers
(12x6)+(1x8)+(16x6)= 176g/mol
176 g = 1 mol
0,5 g = x mol 500mg= 0,5 grams
molar mass = mass÷ moles
176 = 0,5÷ x
x= 2,84 x 10⁻³ mol
2) To find the number of molecules present in those 2,84 x 10⁻³ mol we need to multiple the moles by the Avogadro's constant
No. of molecules = Avogadro's constant x n° of moles
No. of molecules = 6.022 x 10²³ x 2,84 x 10⁻³
= 1.71 x 10²¹ molecules of vit C.
1.71 x 10²¹ molecules of ascorbic acid.
Further explanationThe Problem:
How many molecules of ascorbic acid (vitamin C or C₆H₈O₆) are in a 500 mg tablet?
The Process:
Step-1
We prepare the molar mass of ascorbic acid or C₆H₈O₆.
Relative atomic mass (in rounding to integers):
C = 12 g/molH = 1 g/mol O = 16 g/molIn ascorbic acid, there are six carbon atoms, eight hydrogen atoms, and six oxygen atoms. Therefore the molar mass is given by
[tex]\boxed{(12 \times 6) + (1 \times 8) + (16 \times 6) = 176 \ g/moles}[/tex]
Step-2
We calculate the moles of 500 mg ascorbic acid. Let us convert it to 0.5 g.
[tex]\boxed{ \ moles = \frac{mass}{molar \ mass} \ } \rightarrow \boxed{ \ moles = \frac{0.5 \ g}{176 \ g/mol} \ }[/tex]
Therefore we get 2.84 x 10⁻³ moles.
Step-3
Remember this, one mole contains 6.02 x 10²³ molecules, which is called The Avogadro's number.
Let us convert 2.84 x 10⁻³ moles to the number of molecules (N).
[tex]\boxed{ \ moles = \frac{N}{6.02 \times 10^{23}} \ } \rightarrow \boxed{ \ N = moles \times 6.02 \times 10^{23} \ } [/tex]
[tex]\boxed{ \ N = 2.84 \times 10^{-3} \ moles \times 6.02 \times 10^{23} \ \frac{molecules}{mol} \ }[/tex]
Thus the amount of molecules in 500 mg C₆H₈O₆ are [tex]\boxed{ \ 1.71 \times 10^{21} \ molecules \ }[/tex].
- - - - - - -
Quick Steps
[tex]\boxed{ \ \frac{6.02 \times 10^{23} \ molecules}{1 \ mol} \times \frac{1 \ mole}{176 \ gram} \times 0.5 \ grams \ } = \boxed{ \ 1.71 \times 10^{21} \ molecules \ }[/tex]
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Related Questions
Name the astrophysicist who first advanced the idea that the chemical elements originated from hydrogen in stars
Answers
The astrophysicist who had the first advance idea that the chemical elements origanted are from the hydrogen in the stars is Hubert Reeves. He was a French and Canadian astrophycist in which is also responsible of proposing the idea given in the statement above as he was concluding his studies and researches in regards with hydrogen and helium.
What is the mathematical relationship between color (wavelength) and energy
Answers
how many hydrogen atoms are in 78.4 grams of hydrochloric acid
Answers
Answer: [tex]12.95\times 10^{23}[/tex]
Explanation:
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
[tex]{\text {Moles of HCl}=\frac{78.4g}{36.5g/mol}=2.15[/tex]
According to Avogadro's law, 1 mole of every substance contains Avogadro's number of particles.
1 mole of HCl contains=[tex]6.023\times 10^{23}[/tex] atoms of Hydrogen
2.15 moles of HCl contains=[tex]\frac{6.023\times 10^{23}}{1}\times 2.15=12.95\times 10^{23}[/tex] atoms of hydrogen.
How much heat energy is produced by 0.5 Wh of electrical energy?
Answers
1 watt = 3.41214 Btu/h
1watt * 1h = 3.41214 Btu/h * h
1 = 3.41214 Btu/ (watt*h)/
0.5 watt * h = 0.5 watt*h * 3.41214 Btu/(watt*h) = 1.706 Btu
For the reaction 2hbr(g)⇌h2(g)+br2(g), k= 2.00×10−19 at 298 k what can be said about this reaction at this temperature? hints for the reaction , at 298 what can be said about this reaction at this temperature? the equilibrium lies far to the right. the reaction will proceed very slowly. the reaction contains significant amounts of products and reactants at equilibrium. the equilibrium lies far to the left.
Answers
The equilibrium constant k is actually the ratio of the concentration of the products over the concentration of reactants at equilibrium. So if the concentration of products < concentration of reactants, therefore the constant k will be small. But if the concentration of products > concentration of reactants, the constant k will be large. In this case the value is too small (x10^-19), therefore we can say that the reaction favors the reactant side:
the equilibrium lies far to the left
Based on the given equilibrium constant [tex]\( K = 2.00 \times 10^{-19} \)[/tex] at 298 K, we can conclude that the equilibrium lies far to the left. The correct option is D.
Based on the equilibrium constant [tex]\( K = 2.00 \times 10^{-19} \)[/tex] at 298 K for the reaction [tex]\( 2 \text{HBr(g)} \rightleftharpoons \text{H}_2 \text{(g)} + \text{Br}_2 \text{(g)} \)[/tex], we can analyze the behavior of the reaction at this temperature:
- A. The equilibrium lies far to the right: This statement is incorrect. A very small equilibrium constant (like [tex]\( 2.00 \times 10^{-19} \)[/tex]) indicates that at equilibrium, the concentration of products (H2 and Br2) is extremely low compared to the concentration of reactants (HBr). Therefore, the equilibrium does not lie far to the right; rather, it indicates that the reaction heavily favors the reactants over the products.
- B. The reaction will proceed very slowly: This statement is correct. With such a small equilibrium constant, the position of equilibrium strongly favors the reactants. As a result, the forward reaction (formation of H2 and Br2) is highly unfavorable under normal conditions, leading to a very slow rate of reaction. The reverse reaction (formation of HBr from H2 and Br2) will dominate, but it will also be slow due to the low concentrations of H2 and Br2.
- C. The reaction contains significant amounts of products and reactants at equilibrium: This statement is incorrect. A very small equilibrium constant indicates that the equilibrium position contains almost entirely reactants and only trace amounts of products. The concentrations of products (H2 and Br2) are negligible compared to the reactant (HBr) at equilibrium.
- D. The equilibrium lies far to the left: This statement is correct. A very small equilibrium constant suggests that the equilibrium position heavily favors the reactants (HBr) over the products (H2 and Br2). The equilibrium lies far to the left, indicating that the reaction predominantly exists in the form of reactants at equilibrium.
The complete question is
For the reaction 2HBr(g)⇌H2(g)+Br2(g), K= 2.00×10⁻¹⁹ at 298 K what can be said about this reaction at this temperature?
A. The equilibrium lies far to the right.
B. The reaction will proceed very slowly.
C. The reaction contains significant amounts of products and reactants at equilibrium.
D. The equilibrium lies far to the left.
Express as an ordinary number.
3.85 x 10 -3 =
0.00385
3,850
0.385
Answers
The answer is 0.00385
Hope it helped!
Composite cylindrical wall is composed of two materials of thermal conductivity ka and kb, which are separated by a very thin, electric resistance
Answers
The rate of heat conduction through a composite cylindrical wall and a window can be determined using the formula: Q = (k * A * △T) / d. By comparing the rates of heat conduction for the wall and the window, we can determine which material conducts heat more efficiently.
Explanation:The rate of heat conduction can be determined using the formula:
Q = (k * A * △T) / d
where Q is the rate of heat conduction, k is the thermal conductivity, A is the area, △T is the temperature difference, and d is the thickness of the material.
For the first scenario, the wall with a thermal conductivity twice that of glass wool, let's assume the thermal conductivity of glass wool is ka. So, the thermal conductivity of the wall is 2 * ka. The thickness of the wall is 13.0 cm and the area is 10.0 m². Since the temperature difference is the same for both scenarios, we can calculate the rate of heat conduction for the wall.
For the second scenario, the window with a thickness of 0.750 cm and an area of 2.00 m², we can calculate the rate of heat conduction using the given formulas and values.
By comparing the two rates of heat conduction, we can determine which material conducts heat more efficiently.
what is the mass of 5.55 x 10 formula units of calcium chloride.
Answers
(5.55 x 10^22)/(6.022 x 10^23) = 0.092 mol CaCl₂.
Since the molar mass of CaCl₂ is 40.08 + 2*35.45 = 110.98 g/mol, we have:
Mass CaCl₂ = 0.092 * 110.98 = 10.2 g.
I hope this helps!
The mass of calcium chloride by calculating molar mass and multiplying it by given mass the mass will be 10.2g
what is the molar mass?Molar mass is the specified mass of a substance which is present in moles of a substance. The SI unit is gram per mole .it can be calculated by multiplying the given number in periodic table to the number of moles or atom given in data .
Molar mass of calcium chloride
mass of calcium = 40
mass of chloride = 35
molar mass = 40.078 + 35.4 × 2 = 110.98
calculating molar mass by Avogadro's number = 2.303 × 10²³ × 5.55 x 10
Avogadro constant = 2.303 × 10²³
mass of calcium chloride = 0.092 mol
mass of calcium chloride = molar mass × calculated molar mass
substituting the value,
mass of calcium chloride = 110.98 × 0.092 mol
mass 0f calcium chloride = 10.2 g
Therefore, the mass of calcium chloride by calculating the molar mass of calcium chloride will be 10.2 g
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A rate is equal to 0.0200 m/s. if [a] = 0.100 m and rate = k[a]2[b]2, what is the new rate if the concentration of [a] is increased to 0.200 m?
Answers
By doubling concentration [a] from 0.100 M to 0.200 M in a chemical reaction where the rate is proportional to the square of [a], the rate quadruples. Consequently, the new rate is 0.0800 M/s given the original rate was 0.0200 M/s.
Explanation:The question involves a chemical reaction where the rate is proportional to the square of the concentration of reactant A, given as rate = k[a]2[b]2. When the concentration of A ([a]) is increased from 0.100 M to 0.200 M, the rate of the reaction changes accordingly. Considering the reaction rate's dependence on the concentration, and using the given rate equation, the new rate will be:
Original rate = k(0.100 M)2[b]2
New rate when [a] is doubled = k(0.200 M)2[b]2 = k(4)(0.100 M)2[b]2
= 4 × (original rate)
Therefore, if the original rate is 0.0200 M/s, the new rate when the concentration of A is doubled will be 0.0800 M/s.
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Why are the electron affinities of the group 4a elements more negative than those of the group 5a elements?
Answers
The electron affinities of Group 4A elements are more negative than those of Group 5A elements due to their different electronic structures.
Explanation:The electron affinities of the Group 4A elements are more negative than those of the Group 5A elements due to the electronic structure of these groups. Group 4A elements have a filled ns subshell and the next electron is added to the higher energy np subshell. This disrupts the expected trend in electron affinity. In contrast, Group 5A elements have a half-filled np subshell, and the next electron must be paired with an existing np electron, which also disrupts the trend.
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If an ice cube and a scoop of table salt are left outside on a warm, sunny day, why does the ice cube melts and the salt doesn’t
Answers
For a given substance the amount of light absorbed depends upon what four factors
Answers
1. The wavelength of light.
2. The extinction coefficient of the absorbing material.
3. The path lenght of the medium through which the light is travelling and
4. The concentration of the substance.
"these two beakers represent solutions of hcl and naoh". describe a third beaker showing the ions that remain after the reaction has gone to completion.
Answers
The third beaker would only contain Cl- and Na+ ions, with no H+ or OH- ions remaining.
Based on the image, which shows two beakers containing solutions of HCl and NaOH, and the information provided, here's what the third beaker would look like after the reaction has gone to completion:
**Third beaker:**
* **OH- ions:** 0
* **Cl- ions:** Present (same number as in the original HCl solution)
* **Na+ ions:** Present (same number as in the original NaOH solution)
* **H+ ions:** 0
**Explanation:**
The reaction between HCl (hydrochloric acid) and NaOH (sodium hydroxide) is a neutralization reaction, which means it produces water and a salt. In this case, the salt formed is sodium chloride (NaCl).
The balanced chemical equation for the reaction is:
HCl + NaOH -> NaCl + H2O
Here's how the ions break down:
* **HCl:** dissociates in water to form H+ and Cl- ions.
* **NaOH:** dissociates in water to form Na+ and OH- ions.
When these solutions are mixed, the H+ ions from HCl react with the OH- ions from NaOH to form water molecules (H2O). Since the reaction goes to completion, all the H+ and OH- ions are consumed, leaving behind:
* **Cl- ions:** These remain unchanged from the original HCl solution.
* **Na+ ions:** These remain unchanged from the original NaOH solution.
Therefore, the third beaker would only contain Cl- and Na+ ions, with no H+ or OH- ions remaining.
The probable question may be:
These two beakers represent solutions of HCl and NaOH. Describe a third beaker showing the ions that remain after the reaction has gone to completion.
1.) The third beaker contains __ OH- ion(s), __ Cl- ion(s), __ Na+ ion(s), and __ H+ ion(s)
What best describes a material's ability to dissolve?
Solubility
Melting point
Boiling point
Thermal conductivity
Answers
Solubility is the correct answer. when something dissolves, it is called solubility.
A material's ability to dissolve is described by its solubility, which is influenced by the types of bonds in the solute and solvent. Melting point, boiling point, and thermal conductivity do not describe this ability.
Explanation:The material's ability to dissolve is best described by the term 'solubility'. Solubility is a chemical property that refers to the ability of a solute (the substance being dissolved) to dissolve in a solvent (the substance doing the dissolving). This ability is determined by the type of bonds in the solute and the solvent. And though it might sound complicated, you could see solubility in everyday life, like when you dissolve sugar in your coffee or tea.
Melting point, boiling point, and thermal conductivity, while important properties as well, do not describe a material's ability to dissolve. The melting point is the temperature at which a solid becomes a liquid, the boiling point is the temperature at which a liquid turns into a vapor, and thermal conductivity is a measure of a material's ability to conduct heat.
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A stationary store has decided to accept a large shipment of ball-point pens if an inspection of 20 randomly selected pens yields no more than two defective pens. find the probability that the shipment is accepted if 5% of the total shipment is defective?
Answers
Answer: Probability that the shipment is accepted is 92.45%.
Step-by-Step Explanation:
Since we have given that
Number of total pens = 20
Probability of defective pens = 5%
Probability of good pens = 95%
We need to find the probability that the shipment that yields no more than two defective pens.
So, we will use "Binomial distribution:
[tex]P(x\leq 2)=P(x=0)+P(x=1)+P(x=2)\\\\P(x\leq 2)=0.95^{20}+^{20}C_1(0.5)(0.95)^{19}+^{20}C_2(0.05)^2(0.95)^{18}\\\\P(x\leq 2)=0.9245=92.45\%[/tex]
Hence, Probability that the shipment is accepted is 92.45%.
A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?
A. 13
B. 5
C. 9
D. 4
Answers
The number of neutrons in the given neutral atom of beryllium is equal to 5. Therefore, option (B) is correct.
What is a neutral atom?A neutral atom can be described as an atom in which the number of the positive charge is equal to the number of the negative charge. Therefore, the overall charge on the neutral atom is equal to zero.
For a neutral atom, we can say that the number of electrons in an atom is equal to the number of protons in that atom. All chemical elements are arranged in the modern periodic table are present in the neutral state.
The average mass or atomic mass of the atom is equal to the sum of the number of protons and neutrons present in the nucleus of an atom.
Given, the average mass of a neutral atom of beryllium (Be) = 9
Therefore, neutrons + protons = 9 in the Be atom
The number of electrons for the neutral atom of Be = 4
The number of neutrons in Be atom = 9 - 4 = 5
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Which molecular geometries can stem from tetrahedral electronic geometry?
Answers
Tetrahedral electronic geometry can result in three molecular geometries: tetrahedral, trigonal pyramidal, and bent, these are determined by the number of regions of high electron density that are bonded or lone pairs.
Explanation:The molecular geometries that can stem from tetrahedral electronic geometry include: tetrahedral geometry, trigonal pyramidal geometry, and bent geometry. In tetrahedral geometry, all four regions of high electron density are bonded, resulting in a 109.5° bond angle. With trigonal pyramidal geometry, there are three bonded regions and one lone pair of electrons, slightly altering the bond angle. Finally, in bent geometry, there are two bonded regions and two lone pairs of electrons, again slightly reducing the bond angle to around 104.5°.
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Molecular geometries stemming from tetrahedral electronic geometry include tetrahedral, trigonal pyramidal, and bent shapes, as seen in CH₄, NH₃, and H₂O respectively.
When a central atom is surrounded by four electron groups, the electron-pair geometry will be tetrahedral. If all four electron groups are bonding pairs, the molecule also has a tetrahedral molecular geometry, such as in methane (CH₄). However, if one or more of these groups are lone pairs, the molecular geometry changes. With one lone pair, the molecular shape is trigonal pyramidal, as seen in ammonia (NH₃). With two lone pairs, the molecular shape is bent, like in water (H₂O).
The key point to remember is that while the electron group geometry remains tetrahedral when accommodating lone pairs, the molecular geometry alters to minimize electron pair repulsions, resulting in different molecular shapes.
What mass of manganese (II) chloride must react with sulfuric acid to release 49.5 mL of hydrogen chloride gas at STP? MnCl2(s) + H2SO4(aq)-->MnSO4(aq) + 2HCl(g)
Answers
(0.0495L HCl) / (22.414 L/mol) x (1 mol MnCl2 / 2 mol HCl) x (125.8440 g MnCl2/mol) = 0.1389595342 approximately 0.139 g MnCl2
The mass of the manganese II chloride or Mncl2 will be 0.139 g MnCl2
Using the balanced reaction equation and stoichiometry, tha mass of MnCl2 is 0.14 g.
What is chemical reaction?The term chemical reaction refers to the interaction between reactants to yield products. The reaction equation is; MnCl2(s) + H2SO4(aq)-->MnSO4(aq) + 2HCl(g)
1 mole of HCl gas occupies 22400mL
x moles of HCl occupies 49.5 mL
x = 0.0022 moles
Now;
1 mole of MnCl2 yields 2 moles of HCl
x moles MnCl2 yields 0.0022 moles molesof HCl
x = 0.0011 moles
Mass of MnCl2 = 0.0011 moles * 126 g/mol = 0.14 g
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When some ionic compounds dissolve, not all of their bonds dissociate. what kind of conductivity would you expect such a solution to have?
Answers
Explanation:
As we know that ionic compounds are able to dissolve in polar solvents. And, if these compounds completely dissociate into ions into the solution then this type of solution will have good conductivity.
Whereas some ionic compounds dissolve, and not all of their bonds dissociate. This means the solution will not have much ions due to which flow of electricity will be less.
Thus, we can conclude that when some ionic compounds dissolve, not all of their bonds dissociate. We can expect such a solution to have small amount of electricity or conductivity.
Answer:
If an ionic compound will not dissociate completely, the conductivity of the solution will be lesser than completely dissociating compounds.
Explanation:
When an ionic compound dissolves in water it dissociates to produce ions.
As we know the conductivity of an ionic solution is directly proportional to the strength of dissociation of ionic compound.
If an ionic compound dissociates more, its conductivity will be high.If the compound dissociates less, its conductivity will be lesser.So we can conclude that, The ionic compound with low dissociation will show lesser conductivity.
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_____ sedimentary rocks are made of once-living things or their pieces. A. Organic B. Inorganic C. Chemical D. Fragmental
Answers
Answer:
A. Organic
Explanation:
Once living things have rocks that are made up of organic content as sedimentary rocks are best suited to preserve the remains of the fossils and for keeping records. The organic sediments in rocks are formed due to the accumulation of organic debris collected from various natural sources. As there are swampy sediments that contain various carbon traces and are black, and soft. Fossils are very important elements of depositional environment and especially trace fossils like burrows, footprints and leaf impressions, etc. Some examples of corals and other shell fossils indicate marine deposition.Why was acetyl chloride/ethanol used as the source of hydrochloric acid instead of aqueous hhydrochloric acid?
Answers
Determine how many grams of water are produced when burning 1.33 g of hexane, C6H14, as a component of gasoline in automobile engines. Assume excess oxygen is present
Answers
2C6H14 + 19O2 ...........> 12CO2 + 14H2O
From the periodic table:
mass of hydrogen = 1 gram
mass of oxygen = 16 grams
mass of carbon = 12 grams
Therefore:
molar mass of hexane = 6(12)+14(1) = 86 grams
mass of water = 2(1)+16 = 18 grams
From the balanced equation above:
2(86) = 172 grams of hexane produce 252 grams of water. To know the amount of water produced from 1.33 grams of hexane, all you have to do is cross multiplication as follows:
amount of water = (1.33x252) / 172 = 1.9486 grams
You place a flower 18 feet from a concave mirror. The mirror generates a virtual image of the flower that appears to be behind the mirror. What can you infer about the focal point of the mirror?
Answers
Answer: The focal point of the mirror is greater tahn the 18 feet.
Explanation:
Concave mirror only forms the virtual image when an object is placed between the focal length and principle axis of the concave mirror.
The image generated by the mirror was virtual image of the flower which appeared behind the mirror. The flower was kept at the distance of 18 feet away from the mirror which means that the focal point of the concave mirror is greater than the 18 feet.
Identify the alkyl halide that reacts the fastest in an sn2 reaction.
Answers
Final answer:
Methyl and primary alkyl halides with good leaving groups like iodide or bromide react the fastest in SN2 reactions due to the least steric hindrance.
Explanation:
The alkyl halide that reacts the fastest in an SN2 reaction is one that has the least steric hindrance, which would typically be a methyl or primary alkyl halide. The SN2 reaction mechanism involves a backside attack by the nucleophile and the simultaneous departure of the leaving group in a single, concerted step, leading to inversion of stereochemistry. Bulky alkyl groups hinder the nucleophile's approach, making tertiary alkyl halides react extremely slowly or not at all in SN2 reactions. Therefore, a methyl or primary alkyl halide with a good leaving group such as iodide or bromide would be expected to react the fastest.
Calculate the number of carbon atoms in 25.0 grams of isopropyl alcohol (c3h8o)
Answers
Answer : The number of carbon atoms present in isopropyl alcohol is, [tex]7.51\times 10^{23}[/tex]
Solution : Given,
Mass of isopropyl alcohol = 25 g
Molar mass of isopropyl alcohol = 60 g/mole
In isopropyl alcohol molecule, there are 3 carbon atoms and 8 hydrogen atoms and 1 oxygen atom present.
First we have to calculate the moles of isopropyl alcohol.
[tex]\text{Moles of }C_3H_8O=\frac{\text{Mass of }C_3H_8O}{\text{Molar mass of }C_3H_8O}=\frac{25g}{60g/mole}=0.416moles[/tex]
As we know that 1 mole of gas contains [tex]6.022\times 10^{23}[/tex] number of atoms
As, 1 mole of gas contains [tex]3\times 6.022\times 10^{23}[/tex] number of carbon atoms
So, 0.416 mole of gas contains [tex]0.146\times 3\times 6.022\times 10^{23}=7.51\times 10^{23}[/tex] number of carbon atoms
Therefore, the number of carbon atoms present in isopropyl alcohol is, [tex]7.51\times 10^{23}[/tex]
There are 7.53×10²³ atoms of carbon in 25 g of isopropyl alcohol C₃H₈O
We'll begin by calculating the number of mole in 25 g of C₃H₈O. This can be obtained as follow:
Mass of C₃H₈O = 25 g
Molar mass of C₃H₈O = (12×3) + (8×1) + 12
= 36 + 8 + 16 = 60 g/mol
Mole of C₃H₈O =?Mole = mass / molar mass
Mole of C₃H₈O = 25 / 60
Mole of C₃H₈O = 0.417 moleNext, we shall determine the number of mole of C in 0.417 mole of C₃H₈O.
1 mole of C₃H₈O contains 3 moles of C.
Therefore, 0.417 mole of C₃H₈O. Will contain = 0.417 × 3 = 1.251 moles of C.
Finally, we shall determine the number of atoms in 1.251 moles of C. this can be obtained as follow:
From Avogadro's hypothesis,
1 mole of C = 6.02×10²³ atoms
Therefore,
1.251 moles of C = 1.251 × 6.02×10²³
1.251 moles of C = 7.53×10²³ atomsThus, we can conclude that 25.0 g of isopropyl alcohol, C₃H₈O contains 7.53×10²³ atoms of carbon.
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The concentration of pb2+ in a commercially available standard solution is 1.00 mg/ml. what volume of this solution should be diluted to 6.0×102 ml to produce a solution in which the concentration of pb2+ is 0.054 mg/l?
Answers
The volume of 0.00324 ml of 1.00 mg/ml of Pb²⁺ solution should be diluted to make 6 × 10² mL of 0.054 mg/l.
What is the dilution law?The concentration or the volume of the concentrated solution or dilute solution can be determined by using the following equation:
C₁V₁ = C₂V₂
where C₁ and V₁ are the concentration and volume of the concentrated respectively and C₂ and V₂ are the concentration and volume of the dilute solution.
Given, a Pb²⁺ solution of concentration, C₁ = 1.00 mg/ml
The concentration of the diluted solution, C₂ = 0.054 mg/l
The volume of diluted solution of Pb²⁺, V₂ = 6 × 10² mL
Substitute the value of the concentration and volume in equation (1):
(1.00)× (V₁) = (0.054/1000) × ( 6 × 10²)
V₁ = 0.0324 ml
Therefore, the volume of Pb²⁺ solution of 0.0324 ml of concentration 1.00 mg/ml should be diluted.
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Need to dilute approximately 0.0324 mL of the 1.00 mg/mL standard solution.
To solve this problem, we need to use the concept of dilution. The dilution equation is given by:
C₁ × V₁ = C₂ × V₂
where C₁ is the initial concentration of the solution, V₁ is the volume we need to find, C₂ is the final concentration after dilution, and V₂ is the final volume after dilution.
Given:
C₁ = 1.00 mg/mL = 1000 mg/LC₂ = 0.054 mg/LV₂ = 6.0 × 10² mL = 600 mL (since 1 mL = 1 L)We need to find V₁. Rearranging the dilution equation to solve for V₁, we get:
V₁ = (C₂ × V₂) / C₁
Substituting the given values:
V₁ = (0.054 mg/L × 600 mL) / 1000 mg/L
V₁ ≈ 0.0324 mL
Thus, approximately 0.0324 mL of the standard Pb²⁺ solution should be diluted to 600 mL to achieve the desired concentration of 0.054 mg/L.
For isoelectronic ions, how are effective nuclear charge and ionic radius related?
A) As nuclear charge (Z) increases, ionic radius increases.
B) As nuclear charge (Z) increases, ionic radius decreases.
Answers
Answer:
Therefore, correct option is B.
Explanation:
For isoelectronic ions : As the nuclear charge increases the atomic radius decreases due to increase in the attractive force on the outermost electrons.
How massive would earth have been if it had accreted hydrogen compounds in addition to rock and metal? assume the same proportion of the ingredients as listed in the table?
Answers
> How massive would earth have been if it had accreted hydrogen compounds in addition to rock and metal?
From the table, we can actually see that the relative abundance of the compounds are:
Hydrogen compounds = 1.4%
Rock = 0.4%
Metal = 0.2%
Earth has only rock and metals therefore the total percentage is (0.4 + 0.2)% = 0.6%.
Now if we are to include hydrogen compounds, so the new total is (0.4 + 0.2 + 1.4)% = 2.0%
The ratio is then:
2.0% / 0.6% = 3.3
Therefore the Earth would be 3.3 times more massive.
> The same procedure of calculation is performed when we would like to include the Helium and hydrogen gas
What is the difference between accuracy and precision and which is most important to scientific measurement?
Answers
Accuracy is how close the test results to the standard known value. If the actual value is 10, an accurate test would give 8, 12, 11, 10, 13. In this case, the test is varied but the means of the value is close to 10. The standard deviation might be big.
I would say precision is better. Accuracy can be fixed using calibration. In the example above, if you add (-5) to the value the test will give 10, 11, 9, 10, 11 value which has become near the actual value(the accuracy become higher) but has a smaller standard deviation(the precision is still high).
Which chemical equation is balanced?
2PCl5 + 2H2O → 2HCl + H3PO4
PCl5 + H2O → HCl + H3PO4
PCl5 + 3H2O → 5HCl + H3PO4
PCl5 + 4H2O → 5HCl + H3PO4
Answers
Answer: Option (d) is the correct answer.
Explanation:
An equation will be said balanced equation when there are equal number of atoms on both reactant and product side.
For example, [tex]PCl_{5} + 4H_{2}O \rightarrow 5HCl + H_{3}PO_{4}[/tex]
Number of atoms on reactant sides are as follows.
P = 1
Cl = 5
H = 8
O = 4
Number of atoms on product side are as follows.
P = 1
Cl = 5
H = 8
O = 4
Thus, there are equal number of atoms on both reactant and product side. Hence, this equation is balanced.