The expected absorbance for the dilute aspirin solution with a concentration of 0.000529 M and a Beer's Law plot slope of 1550.7 m-1 is 0.81967, according to the Beer's Law equation [tex]A = \epsilon b \times c[/tex].
The student has been tasked with determining the expected absorbance value of a dilute aspirin solution using Beer's Law. Beer's Law states that absorbance (A) is equal to the molar absorptivity (ε) times the path length (b) times the concentration (c).
In this case, the slope of the Beer's Law plot represents the product of the molar absorptivity and the path length (εb).
The given slope is 1550.7 m-1 and the concentration of the solution is 0.000529 M. Therefore, the expected absorbance (A) is calculated by multiplying these two:
[tex]A = \epsilon b \times c[/tex]
[tex]A = 1550.7 m^{-1} \times 0.000529 M = 0.81967[/tex]
This value represents the expected absorbance for the aspirin solution, assuming a path length of 1 cm.
What is the formula mass of beryllium chloride , becl2? express your answer to four significant figures and include the appropriate units?
The formula mass of beryllium chloride (BeCl₂) is 79.92 u to four significant figures.
The formula mass of beryllium chloride, BeCl₂, is calculated by summing the atomic masses of beryllium and chlorine. The atomic mass of beryllium is approximately 9.012 u and that of chlorine is 35.453 u. Since there are two chlorine atoms in beryllium chloride, we need to take two times the atomic mass of chlorine and add it to the atomic mass of beryllium.
So the calculation for the formula mass of BeCl₂ is as follows:
Formula mass = Atomic mass of Be + (2 ˣ Atomic mass of Cl)
= 9.012 u + (2 * 35.453 u)
= 9.012 u + 70.906 u
= 79.918 u
Expressed to four significant figures, the formula mass of BeCl₂ is 79.92 u (atomic mass units).
How many fe(ii) ions are there in 15.0 g of feso4?
Answer : The number of Fe(II) ions present are [tex]5.94\times 10^{22}[/tex]
Explanation : Given,
Mass of [tex]FeSO_4[/tex] = 15.0 g
Molar mass of [tex]FeSO_4[/tex] = 152 g/mole
First we have to calculate the moles of [tex]FeSO_4[/tex]
[tex]\text{Moles of }FeSO_4=\frac{\text{Mass of }FeSO_4}{\text{Molar mass of }FeSO_4}=\frac{15.0g}{152g/mole}=0.0987mole[/tex]
Now we have to calculate the number of Fe(II) ions.
In [tex]FeSO_4[/tex], there 1 atom of iron ion and 1 atom of sulfate ion.
As we know that,
1 mole of substance always contains [tex]6.022\times 10^{23}[/tex] number of atoms or ions.
As, 1 mole of [tex]FeSO_4[/tex] contains [tex]6.022\times 10^{23}[/tex] number of Fe(II) ions.
So, 0.0987 mole of [tex]FeSO_4[/tex] contains [tex]0.0987\times 6.022\times 10^{23}=5.94\times 10^{22}[/tex] number of Fe(II) ions.
Therefore, the number of Fe(II) ions present are [tex]5.94\times 10^{22}[/tex]
Why should a new splint be used for each compound?
Which of the following statements describes a solid?
A.) It is easily compressed
B.) Its particles are packed together tightly
C.) It takes the volume of its container
D.) It takes the shape of its container
Answer: Option (B) is the correct answer.
Explanation:
In solids, molecules are held together by strong intermolecular forces of attraction. Hence, the molecules are much more closer to each other.
As a result, they are unable to move from their initial position and can only vibrate at their mean position.
Hence, a solid has definite shape and volume. Solids cannot be compressed.
Whereas in a liquid, particles are held by less strong intermolecular forces of attraction as compared to solids. Therefore, in a liquid molecules are able to slide past each other and thus, they can be slightly compressed.
Liquids do not have a fixed shape but they do have a fixed volume.
In gases, molecules are widely spread out as they are held by weak Vander waal forces. Hence, they do not have a fixed shape but they acquire the volume of container in which they are placed.
Thus, we can conclude that the statement its particles are packed together tightly, is correct.
Calculate the mass of butane needed to produce 96.7 g of carbon dioxide
A metal M is converted to the metal sulfate M2(SO4)3. then a soultion of the metal sulfate was treated with calcium chloride to give calcium sulfate perciptate.If 1.2 g of the metal gave 5.451 g calcium sulfate what is the identity of metal M?
M2(SO4)3(aq)+3CaCl2(aq) ----->
2MCl3(aq)+3CaSO4(s)
Draw the structural formula of 4,5-diisopropylnonane.
The structural formula of 4,5-diisopropylnonane is CH3-(CH2)3-C(CH3)2-C(CH3)2-(CH2)4-CH3. It represents a nine-carbon alkane with isopropyl groups on the fourth and fifth carbon.
Explanation:The name 4,5-diisopropylnonane tells us that the compound is a nine-carbon alkane with isopropyl groups on the fourth and fifth carbon. The term 'nonane' represents a chain of nine carbon atoms. An isopropyl group is a carbon group with the formula -CH(CH3)2, which can be represented visually with one carbon connected to a carbon that is also connected to two other carbons with all remaining bonds with hydrogen. The fourth and fifth carbons in the chain of nonane have this type of structure attached. Therefore, the structural formula of 4,5-diisopropylnonane is as follows: CH3-(CH2)3-C(CH3)2-C(CH3)2-(CH2)4-CH3
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Otocz kółkiem symbole pierwiastków chemicznych
Na, H2O, KI, O, S, CO, MgO, Co, Si, Al, Fe2O3
if the waste you have contains 100.0 grams of silver nitrate, how many mols of silver nitrate is this
To find the number of moles of silver nitrate, divide the mass by the molar mass.
Explanation:To determine the number of moles of silver nitrate in a given mass, we need to use the molar mass of silver nitrate. The molar mass of silver nitrate (AgNO3) is 169.88 g/mol.
Given that the waste contains 100.0 grams of silver nitrate, we divide the mass by the molar mass to find the number of moles:
Number of moles = Mass (g) / Molar mass (g/mol)
Number of moles = 100.0 g / 169.88 g/mol = 0.589 mol
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1. Given 100.0 grams of silver nitrate, we calculate it to be approximately 0.588 moles of silver nitrate.
2. According to the balanced chemical equation with copper, 0.294 moles of copper are needed to completely react with the silver nitrate. This ensures the reaction proceeds to completion.
To determine the number of moles of silver nitrate (AgNO₃) from the given mass, we use its molar mass:
Determine the molar mass of AgNO₃: 169.88 g/mol.Calculate the moles of silver nitrate:Next, we need to determine how many moles of copper (Cu) are needed to react completely with the silver nitrate.
The balanced chemical reaction between these two substances is:
2AgNO₃(aq) + Cu(s) → Cu(NO₃)₂ (aq) + 2Ag(s)From the balanced equation, we see that 1 mole of Cu reacts with 2 moles of AgNO₃. Therefore, we use the stoichiometric ratio to find the required moles of copper:
Moles of Cu = 0.588 mol AgNO₃ * (1 mole Cu / 2 moles AgNO3) = 0.294 mol CuCorrect question is: Answer the following :
1. If the waste you have contains 100.0 grams of silver nitrate, how many moles of silver nitrate is this? (Use the molar mass of the silver nitrate from above)
2. If you found that the waste contains 100.0 grams of silver nitrate, how many moles of copper would you need to completely react with all of the silver nitrate?
436 K = °C
163
709
-163
-709
Answer : The correct option is, [tex]163^oC[/tex]
Explanation :
The conversion used for the temperature from Kelvin to degree Celsius is:
[tex]K=273+^oC[/tex]
where,
K = temperature in Kelvin = 436 K
[tex]^oC[/tex] = temperature in degree Celsius = ?
Now put the value in the above conversion, we get the temperature in degree Celsius.
[tex]436=273+^oC[/tex]
[tex]^oC=436-273[/tex]
[tex]^oC=163[/tex]
Therefore, the temperature in degree Celsius is, [tex]163^oC[/tex]
A certain shade of blue has a frequency of 7.03 × 1014 Hz. What is the energy of exactly one photon of this light?
The energy of one photon of light with a frequency of 7.03 × 1014 Hz is approximately 4.65618 × 10-19 Joules. This is obtained using Planck's equation, E = hf, where E is the energy, h is Planck's constant and f is the frequency of the light.
Explanation:
The subject of this question is Physics. The student wants to know the energy of exactly one photon of light that has a frequency of 7.03 × 1014 Hz. We can use Planck's equation which relates the energy of photon, its frequency and Planck's constant (h = 6.626 × 10-34 J.s).
So, the energy (E) of the photon is given by the formula E = hf. Substituting the frequency (f = 7.03 × 1014 Hz) and Planck's constant into the formula gives E = (6.626 × 10-34 J.s)(7.03 × 1014 Hz) which gives approximately 4.65618 × 10-19 Joules. This is the energy of one photon of light with a frequency of 7.03 × 1014 Hz.
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Henry was having glass of water with some ice cubes in it and kept it near a window for some time. After some time, the water became warm. What is this process called? A.condensation B.freezing C.melting D.sublimation E.evaporation
The given process is known as melting.
• The process in which a solid get transformed into liquid is known as melting.
• This takes place because of the existence of heat in the surrounding environment.
• The process in which a gas phase turns into a liquid phase is known as condensation.
• The process in which liquid turns into a solid is known as freezing.
• The process when there is a direct transformation of solid into the gas phase is known as sublimation.
• The process in which the liquid molecules get transformed into a gas phase is known as evaporation, this takes place on the surfaces of liquid.
Thus, when the glass of water containing ice cubes is kept outside it gets melt and becomes warm because of the transfer of heat. Therefore, the correct answer is option C, that is, melting.
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At the county fair, Carrie and Sam climbed up on the carousel horses. Around and around they went; the horses also bobbed up and down. When they got off of the carousel, Carrie told Sam they had been accelerating during their ride. Sam disagreed; they had been moving at a constant speed. Whose response is fully correct, and why?
Carrie is correct because acceleration involves a change in direction, not just speed. On the carousel, there is centripetal acceleration due to the constant change in direction of the horses on the carousel.
Carrie's understanding of the situation is fully correct. When they were on the carousel, Carrie and Sam were indeed accelerating despite moving at what seemed to be a constant speed. This is because acceleration is not just a change in speed, but a change in velocity, which includes both speed and direction. In the case of the carousel, although the horses were moving at a constant speed in a circular path, their direction was continually changing, which means they were undergoing centripetal acceleration. The fact that the horses also bobbed up and down adds vertical acceleration to the motion.
Observing other scenarios where objects are in motion, such as on gravity-driven amusement park rides or objects released from moving vehicles, it can be noted that acceleration and perceived motion can vary greatly depending on the observer's frame of reference. For instance, an object dropped by someone who is at rest with respect to the object will observe a different motion compared to someone who is not moving with the object.
In the case of an amusement park ride where a chair is hoisted up at a constant speed, if a rider drops a corndog without giving it any additional speed, it will initially move upwards with the same velocity as the rider, and then slow down due to gravity until it begins to fall towards the ground. The corndog's perceived acceleration from the rider's perspective is negative as it decelerates, but from the ground perspective, the corndog has a positive acceleration downwards (due to gravity) after release.