26. In dilute nitric acid, HNO, copper metal dissolves according to the following equation: How many grams of HNO, are needed to dissolve 11.45 g of Cu according to this equation?
Answers
The correct amount of HNO₃ needed to dissolve 11.45 g of Cu according to the equation is 98.9 grams.
To solve this problem, first, determine the molar mass of copper (Cu) and nitric acid (HNO₃). Copper has a molar mass of 63.55 g/mol, while nitric acid has a molar mass of 63.01 g/mol.
Next, calculate the number of moles of copper present in 11.45 g using its molar mass. This yields approximately 0.180 moles of Cu.
Now, use the stoichiometry of the balanced chemical equation to find the moles of nitric acid needed.
According to the equation, 3 moles of Cu react with 8 moles of HNO₃. Therefore, the moles of HNO₃ needed would be (8/3) × 0.180 = 0.480 moles.
Finally, convert moles of HNO₃ to grams using its molar mass. This gives 0.480 moles × 63.01 g/mol = 30.245 g.
However, this is the amount needed for 0.180 moles of Cu.
To find the amount needed for 11.45 g of Cu, we use the proportion: (30.245 g / 0.180 mol) × 11.45 g = 192.08 g.
The correct answer is 98.9 grams of HNO₃.
To dissolve 11.45 g of Cu, 31.92 grams of HNO₃ are needed.
Molar Mass Calculation:
Molar mass of Cu = 63.55 g/mol
Molar mass of HNO₃ = 63.01 g/mol
Moles of Copper:
[tex]\[ \text{Moles of Cu} = \dfrac{\text{Mass of Cu}}{\text{Molar mass of Cu}} = \dfrac{11.45 \, \text{g}}{63.55 \, \text{g/mol}} = 0.18 \, \text{mol} \][/tex]
Stoichiometry of the Reaction:
According to the balanced equation:
3 moles of Cu react with 8 moles of HNO₃.
Moles of HNO₃:
[tex]= \dfrac{8}{3} \times \text{Moles of Cu} \\= \dfrac{8}{3} \times 0.18 \, \text{mol} = 0.48 \, \text{mol} \][/tex]
Mass of HNO₃:
[tex]\[ \text{Mass of } HNO_3 = \text{Moles of } HNO_3 \times \text{Molar mass of }HNO_3\\ = 0.48 \, \text{mol} \times 63.01 \, \text{g/mol} \\= 31.92 \, \text{g} \][/tex]
Related Questions
I need help with #26
Answers
Radioactive substances decay and emit alpha, beta, positron, and gamma particles in the process of converting to stable nuclei. An alpha particle has two protons and two neutrons, is relatively heavy and deflected by electrical and magnetic fields. Beta particles are fast moving electrons which are greatly deflected by electrical and magnetic fields. Gamma particles (highly energetic) are neutral and not deflected electrical and magnetic fields. Positron is positively charged beta particle. Opposite charges attract each other. So we can say that alpha particle and positron being positively charged are attracted towards the negative plate. Alpha particle is heavy, so it is slightly deflected towards the negative plate. Beta particle being negatively charged is deflected towards the positive plate and gamma particle is neutral and not deflected in the electrical field.
Therefore, the correct answer is,
A. Beta particle
B. Gamma particle
C. Alpha particle
D. Positron
The correct answer indicating the particle deflected towards the positive plate is option A, the Beta particle. Options B (Gamma particle), C (Alpha particle), and D (Positron) are not deflected towards the positive plate in an electric field.
In the context of radioactive decay, the behavior of particles in electric and magnetic fields provides clues to their charge and mass.
Beta particles, being fast-moving electrons, are negatively charged and deflect towards the positive plate.
Gamma particles, being neutral, remain unaffected by electric and magnetic fields.
Alpha particles, although positively charged, are heavy and only slightly deflected towards the negative plate.
Positrons, being positively charged, would be attracted towards the negative plate.
Therefore, the correct answer indicating the particle deflected towards the positive plate is option A, the Beta particle. Options B (Gamma particle), C (Alpha particle), and D (Positron) are not deflected towards the positive plate in an electric field.
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lewis structures cannot
Answers
Answer:
Show the strength of bonds.
Explanation:
Lewis structures just show the bonding but not the strength.
Answer:
Show the strength of bonds
Explanation:
An element's atomic number is 44. How many electrons would an atom of this element have?
Answers
Atomic number is the number of protons in an atom and is equal to the number of electrons also.
Atomic number = 44.
Hence number of electrons in an atom of this element (with atomic number 44) = 44 electrons.
which describes the composition of the ocean floor?
Answers
The composition of the ocean floor can be described as option A. Basalt covered in sediment
which describes the composition of the ocean floor?Basaltic rocks are the main type of rock on the ocean floor. They are made from cooled lava. Basalt is a kind of rock that has a lot of iron and magnesium. It looks dark and smooth. It forms most of the bottom layer of the ocean.
The ocean floor has different types of stuff called sediments covering it. These sediments can come from land, like rocks breaking down and being carried away, or from sea creatures, like shells and skeletons collecting on the ocean floor.
Hence option a is correct.
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see full text below
Which describes the composition of the ocean floor?
A. Basalt covered in sediment
B. Sediment covered in basalt
C. Granite covered in sediment
D. Basalt covered in granite
Rutherford's research was primarily involved with: electron distribution defining the components of nuclei using electromagnetic energy
Answers
Answer is: defining the components of nuclei.
Rutherford theorized that atoms have their charge concentrated in a very small nucleus.
This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).
Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.
That is different from Plum Pudding model, because it shows that most of the atom is empty space.
Rutherford conducted research that led to the first splitting of the atom in a nuclear reaction.
Ernest Rutherford's research primarily focused on defining the components of nuclei, leading to the discovery of the atomic nucleus and a planetary model of the atom, which advanced the understanding of the atom's structure.
Ernest Rutherford, a pioneering physicist, is renowned for his groundbreaking work that led to the modern understanding of atomic structure. His research involved defining the components of nuclei through experiments with alpha particles. Rutherford's shocking discovery was that atoms consist of a tiny, dense, positively charged nucleus, revolutionizing the atomic model at the time.
Unlike the previous plum pudding model, which assumed a uniform distribution of electrons within a positively charged atom, Rutherford proposed that electrons orbit this central nucleus, analogous to planets orbiting the sun. This model represented a significant shift from the thought that electrons were uniformly distributed throughout the atom's volume. Rutherford's planetary model laid the foundation for the quantum mechanical principles that describe electron distribution in contemporary atomic theory.
Rutherford's experiments involved directing a beam of alpha particles, emitted from the radioactive decay of radium, at thin gold foil. Along with his colleagues Hans Geiger and Ernest Marsden, Rutherford observed the scattering of these particles, leading to the conclusion that a massive positive charge (the nucleus) occupied a minute portion of the atom's space.
How many grams of carbon monoxide are needed to react with an excess of iron (III) oxide to produce 198.5 grams of iron? Fe2O3(s) + 3CO(g) -----à 3CO2(g) + 2Fe(s)
Answers
Answer : The grams of carbon monoxide needed are 148.89 g
Solution : Given,
Mass of iron, Fe = 198.5 g
Molar mass of iron, Fe = 56 g/mole
Molar mass of carbon monoxide, CO = 28 g/mole
First we have to calculate the moles of iron, Fe.
[tex]\text{ Moles of Fe}=\frac{\text{ Mass of Fe}}{\text{ Molar mass of Fe}}=\frac{198.5g}{56g/mole}=3.545moles[/tex]
The balanced chemical reaction is,
[tex]Fe_2O_3(s)+3CO(g)\rightarrow 3CO_2(g)+2Fe(s)[/tex]
From the balanced reaction, we conclude that
2 moles of iron produces from the 3 moles of carbon monoxide
3.545 moles of iron produces from the [tex]\frac{3}{2}\times 3.545=5.3175[/tex] moles of carbon monoxide
Now we have to calculate the mass of carbon monoxide, CO.
[tex]\text{ Mass of CO}=\text{ Moles of CO}\times \text{ Molar mass of CO}[/tex]
[tex]\text{ Mass of CO}=(5.3175moles)\times (28g/mole)=148.89g[/tex]
Therefore, the grams of carbon monoxide needed are 148.89 g
what takes place during a redox reaction
Answers
In a redox reaction, one substance is oxidized (loses electrons) while another substance is reduced (gains electrons). An example is the reaction between hydrogen and fluorine.
Explanation:During a redox reaction, one substance gets oxidized, meaning it loses electrons, while another substance gets reduced, meaning it gains the electrons that were lost by the oxidized substance. This simultaneous oxidation and reduction is why these reactions are referred to as 'redox' reactions. For example, in the reaction between hydrogen and fluorine, H2 + F2 → 2HF, hydrogen is oxidized, as it loses an electron, and fluorine is reduced, as it gains the electron lost by hydrogen.
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Which answer choice is an example of a correct chemical name?
Al2O3
aluminum oxygen
O3Al2
aluminum oxide
Answers
im very postive it is aluminum oxide (;
Hello There,
The answer is:
aluminum oxygen
Hope this help have a great day :)
What do you, a complex, multicellular organism, have in common with this single-celled algae that lives in the ocean? A) We have nothing in common. B) We have similar cell structure. C) We have the exact same cell parts. D) We both need salt water to survive.
Answers
Answer:
The answer is "B". We have similar cell structure.
Explanation:
We have similar cell structure. The algae is made of one cell. We are made of many, many cells. The cells that make up complex living things are different from each other.
The thing that a complex, multicellular organism, has in common with single-celled algae that live in the ocean is B. We have a similar cell structure.
Cells are referred to as the building blocks of life. Cells are important for every organism. It should be noted that while a unicellular organism and one cell, the multicellular organisms have two or more cells. It should be noted that the unicellular organisms and the multicellular organisms have the same cell structure. In this case, the unicellular organisms and the multicellular organisms both have cytoplasm and plasma membranes. They also contain DNA and ribosomes which are important for gene expression.In conclusion, the correct option is B
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Visible light, X Rays infrared radiation and radio waves all have the same
Answers
The common feature of visible light, X-rays, infrared radiation, and radio waves is that they all represent types of electromagnetic radiation, possessing different wavelengths and energy levels, but all moving at the speed of light.
Explanation:Visible light, X-rays, infrared radiation, and radio waves all fall under the umbrella of electromagnetic radiation, which consists of waves of energy that move through space at the speed of light. This spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. The important common feature between all these types of rays is that they travel at the same speed in a vacuum, which is the speed of light, at approximately 299,792 kilometers per second.
Each type of electromagnetic radiation is characterized by its wavelength and frequency, which determine its position in the electromagnetic spectrum. For example, X-rays have shorter wavelengths and thereby more energy, enabling them to penetrate human tissue. Visible light has wavelengths ranges from 380 to 740 nm, frequencies visible to the human eye. Infrared radiation and radio waves have longer wavelengths and lesser energy.
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draw a diagram explaining the relationship between atoms, moles, and molecules
Answers
This diagram explains the relationship between atoms,moles and molecules.
moles ↔ molecules ↔ atoms
Atoms are the building blocks of substances, and molecules are formed by distinct arrangements of atoms. A mole is a unit that enables us to express very large quantities of atoms or molecules. Models like the ball-and-stick aid in visualizing these relationships.
Explanation:The relationship between atoms, moles and molecules can be seen in how each unit of matter interacts with each other. Atoms are the building blocks of substances, and molecules are formed by distinct arrangements of these atoms, typically of more than one element. In the model of an organic molecule, for example, atoms of carbon, hydrogen, nitrogen, oxygen, and sulfur are shown in proportional atomic size, and the chemical bonds indicated by silver rods demonstrate the connections between these atoms (Figure 2.1).
The molecular formula uses chemical symbols and subscripts to indicate the exact numbers of different atoms in a molecule or compound. An empirical formula, meanwhile, gives the simplest, whole-number ratio of atoms forming a compound (molecular orbital theory). When we talk about moles, this is a convenient unit for expressing very large numbers of atoms or molecules. The mass in grams of 1 mole of substance is known as its molar mass. Moreover, you have probably heard about Avogadro's number, which amounts to 6.022 x 10^23, the number of entities composing 1 mole of substance.
A concept that can help visualize these relationships is the ball-and-stick model, which shows the geometric arrangement of atoms within a molecule. This model also illustrates how molecules are three-dimensional, and can describe molecular bonds in terms of their distances, angles, and relative arrangements in space, providing a more in-depth understanding of molecular structure (molecular orbital diagram).
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Helppppp what are the atomic mass neutrons and nuclear charge to these elements? For 15 POINTS
Answers
In these atoms, the positive and negative charges cancel each other out, leading to an atom with no net charge.
(Protons, neutrons, and electrons)
Which of the following is NOT needed in air for water condensation to occur?
A. Temperature at the dew point
B. Condensation nuclei
C. Temperature inversion
D. Water vapor
Answers
Answer:
option C)
Explanation:
correct option is option C)
in troposphere when we move up the temperature goes on decreasing and the hot air from the earth surface comes into contact with the cold air of the troposphere then air gets condensed.
but in temperature inversion when moves up temperature increases and this leads the gases to not to condense.
Elements located in the vertical column of the periodic table are of the same and have____chemical properties.
Answers
Answer:
Similar
Explanation:
Elements that are located in the same vertical colomn or group of the periodic table have similar chemical properties. This is because they have the same amount of valence electrons in the outermost shell.
The continuous release of nuclear energy caused when on fission reaction triggers more nuclear reactions is a _
Answers
Answer: These are called as nuclear chain reactions.
Explanation: Nuclear Fission reactions are the reactions in which one heavier nuclei produces two lighter daughter nuclei.
Nuclear chain reactions are defined as the chemical reactions when one neutron released in a fission reaction produces another fission reactions in other nucleus. The other nucleus again releases neutrons and a chain of reactions is formed.
These reactions are generally uncontrollable.
Hence, The continuous release of nuclear energy caused when on fission reaction triggers more nuclear reactions is a nuclear chain reaction.
What type of energy is present in lightning?
A.) Electrical energy
B.) Chemical energy
C.) Nuclear energy
D.) Potential energy
Answers
A.) Electrical energy
is your answer
A.) Electrical
This was proven by Benjamin Franklin with his kite experiment.
An individual with an excellent sense of smell is handed a bottle of perfume. After smelling the perfume, he reports that the perfume contains a predominant smell of roses with a faint touch of vanilla. If the perfume is made from water, rose essence, and a splash of vanilla, it is most likely A. a mixture. B. a gas. C. an element. D. a compound.
Answers
Answer:
A. a mixture.
Step-by-step explanation:
If the perfume is made from water and anything else, it is a mixture.
B. is wrong, because water is a liquid at room temperature.
C. is wrong, because water is a compound.
D. is wrong, because the perfume is a mixture of water and other compounds.
Answer: A. a mixture.
Explanation:
Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions.Example: Copper [tex]Cu[/tex]
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water [tex]H_2O[/tex]
Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present.The components do not combine chemically and hence retain their original properties. Example: perfume made from water, rose essence, and a splash of vanilla.
Thus the perfume is most likely a mixture as different components retain their original properties.
What is the total anion concentration (in mEq/L ) of a solution that contains 6.0 mEq/L Na + , 11.0 mEq/L Ca 2+ , and 1.0 mEq/L Li + ?
Answers
24
Ddddd
Hope I helped
Which of the following is a solution for reducing greenhouse gases?
public transportation
not recycling
cutting down more trees
Answers
Answer:
public transportation
mark me as brainliest
Answer:
A) public transportation
Explanation:
public transportation can help reduce the amount of cars that contribute to an accumulation of greenhouse gases
Wrong answers:
not recycling contributes to greenhouse gases by requiring new products to be made and contributing to land fills
cutting down more trees both requires tools that create greenhouse gases and lowers the number of trees that could help absorb greenhouse gases
Therefore, the correct answer is A) public transportation
ch4+o2 > CO2+H2O
what's the balance
Answers
the balanced equation is:
CH4 +2O2 -> CO2+2H2O
Answer:
[tex]\huge \boxed{\mathrm{CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf CH_4+ O_2 \Rightarrow CO_2 + H_2O[/tex]
Balancing the Hydrogen atoms on the right side,
[tex]\sf CH_4+ O_2 \Rightarrow CO_2 +2 H_2O[/tex]
Balancing the Oxygen atoms on the left side,
[tex]\sf CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O[/tex]
[tex]\rule[225]{225}{2}[/tex]
What is the number of moles in 432g Ba(NO3)2
Answers
First there is a need to calculate the molar mass of Ba(NO₃)₂:
137.3 + 2 (14.0) + 6 (16) = 261.3 grams/mole
The molar mass, denoted by M in chemistry refers to a physical characteristic illustrated as the mass of a given component divided by the amount of the component. The molar masses are always denoted in grams/mole.
After finding the molar mass, the number of moles can be identified as:
432 grams / 261.3 g/mol = 1.65 moles of Ba(NO₃)₂.
The number of moles in 432g of Ba(NO₃)₂, is 1.653.
To calculate the number of moles in 432g of Ba(NO₃)₂, we first need to find its molar mass. The molar mass of Ba(NO₃)₂ is calculated as follows:
Ba: 137.3 g/molN: 2 x 14.0 g/mol = 28.0 g/molO: 6 x 16.0 g/mol = 96.0 g/molTherefore, the molar mass of Ba(NO₃)₂ is 261.3 g/mol.
Next, we use the formula for the number of moles:
Number of moles = mass / molar massSo, the number of moles of Ba(NO₃)₂ in 432g is:
Number of moles = 432g / 261.3 g/mol = 1.653 molesthink about putting a glass of water on the counter, in the freezer, and on a hot stove how does the temperature of the water affect the kinetic energy and physical state?
Answers
The kinetic energy and the physical state of water depend strongly on the temperature;
Firstly, The kinetic energy of water on a hot stove is higher than that on the counter in the freezer; that the kinetic energy is directly proportional to the temperature according to the relation: [tex]K = \frac{3RT}{2NA}[/tex] ; where R is the universal gas constant, T is the temperature and NA is Avogadro number.As the temperature increases, the speed of colliding molecules increases and the kinetic energy increases.
Secondly, The physical state of water depends on the temperature; water has three states (gas, liquid and solid) depends on the temperature.If a glass of water is putt on the counter in the freezer, it will be converted to the solid state (ice).And, as if it is putt on a hot stove, it will be vapor (gaseous state).why is water a good solvent
Answers
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... This allows the water molecule to become attracted to many other different types of molecules.
What is the density of the table tennis ball ? Record your answer to the nearest hundredth
Answers
The density of a table tennis ball cannot be determined without knowing its mass and volume.
Explanation:The density of a table tennis ball is the mass of the ball divided by its volume.
Since we do not have the mass or volume of the table tennis ball, we cannot calculate its density.
The density of an object is typically measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).
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Table tennis ball's density can't be provided directly without specific mass or volume data. However, it's generally understood to be less than water's density since it floats in water. You can measure the ball’s mass and volume yourself to calculate the density.
Explanation:The density of an object can be calculated by dividing its mass by its volume. We don't have specific mass or volume values for a table tennis ball provided, so we cannot directly provide a density value. However, you can usually find this information on the ball packaging or from the manufacturer. Alternatively, you could calculate it yourself by measuring the mass of the ball using a scale, and the volume by displacement method in a liquid.
Remember, the unit of density is often expressed as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³) depending upon the unit system being used. If we were to compare a table tennis ball generally to water, which has a density of 1 g/cm³, we could say that the table tennis ball has a much lower density because it floats on water.
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A sample of air with a volume of 2.20m3 at a pressure of 105 KPa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 KPa.
What is the new volume?
6.9
1.34
2.56
43.0
2.88
Answers
hope it's right sir
Answer: The answer is 2.88 m3
Explanation: Since temperature, pressure and volume are given in the question, the general gas equation will be useful in calculating the new volume.
General gas equation,
(P1V1)/T1 = (P2V2) /T2 ................ (1)
Where,
P1 = Initial pressure
P2 = Final pressure
V1 = Initial volume
V2 = Final volume
T1 = Initial temperature in kelvin
T2 = Final temperature in Kelvin
Hence, from the question :
P1 = 105 KPa = 105,000 Pa
P2 = 75 KPa = 75,000 Pa
V1 = 2.20 m3
V2 =?
T1 = 30 °C = (273+30) K = 303 K
T2 =10 °C = (273+10) K = 283 K
Therefore, substitute these value into the general gas equation as given in eq (1) above.
V2 = (P1V1T2) /P2V1
V2 = (105000×2.2×283)/ (75000×303)
V2 = 2.88 m3
What happens to the particles of an object as temperature is added to it or taken away from it
Answers
Answer:
If temperature added
If temperature is added to the object, the particles of the object vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the space of matter of the object. This results in increased molecular motion, object expands and takes up more space
If temperature taken away
If temperature is taken away from object, the particles vibrate slower. The atoms can get closer result in the matter contracts.
In both cases the mass is not changes. and it happens in all solids, liquids and gases
How many significant figures are in the following number? 5.67 x 10^6
Answers
there are three sientific figures
exponents decimal multiplication
Significant figures are the digits in a number that carry meaningful information about its precision. The number 5.67 x 10⁶ has three significant figures.
Significant figures are the digits in a number that carry meaningful information about its precision. In this case, the digits 5, 6, and 7 are significant because they represent specific values.
The exponential notation (scientific notation) 10⁶ indicates that the number is multiplied by 10 to the power of 6, which means it is 5.67 million. The zeros at the end of the number are not considered significant; they are used to denote the scale of the value but do not add any additional precision.
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chemicals integrate to kill insects and other pests that damage crops are
Answers
I believe the answer is pesticides
Hello,
Farmer's use many chemicals on their crops. The specific chemical you are looking for is Insecticides. Insecticides are specifically for crops, and it is used to kill insects and bugs. There are three different kinds of pesticides, and the one that mainly kills bugs in insecticides
- I . A -
The equation that describes the process of photosynthesis
Answers
the last choice is the equation for photosynthesis
What is the weight, on earth, if a book with a mass of 1.5kg 1.5N 6.5 N 11.3 N 14.7
Answers
Consider the equation for weight:
W=mg
W is the weight, m is the mass, and g is the acceleration due to gravity.
Therefore, to calculate the weight of an object, just multiply its mass by the acc. due to gravity of the location.
The acc. due to gravity on Earth is approximately 9.81 ms^-2, note that this number may change from place to place, for example, the acc. due to gravity on moon is only 1/6 of Earth's. (Sometimes the question provides g as 10, so make sure you check the instructions before!)
W = 1.5 x 9.81
= 14.715N (≈14.7N)
Therefore, the answer to this question is the last option (or D), 14.7N.