How many molecules are in 2.10 mol CO ?
A.) 2.53 x 10^24
B.) 3.49 x 10^-24
C.) 3.79 x 10^24
D.) 1.26 x 10^24
The number of molecules present in 2.10 moles of CO₂ is 1.264×10²⁴ molecules. Therefore, option D is correct.
What do you mean by mole ?The mole is the amount of substance in a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is "mol".
In the International System of Units, the mole (symbol mol) is the unit of substance amount (SI). The amount of substance is a measurement of how many elementary entities of a given substance are present in an object.
From Avogadro's hypothesis as follows;
1 mole of any substance = 6.023×10²³ molecules.
This implies that:
1 mole of CO₂ = 6.023×10²³ molecules
With the above information, we can obtain the number of molecules in 2.10 moles of CO₂. This can be obtained as given below:
1 mole of CO₂ = 6.023×10²³ molecules
Then,
2.10 moles of CO₂ = 2.10 × 6.02×10²³
2.10 moles of CO₂ = 1.264×10²⁴ molecules
Thus, the number of molecules present in 2.10 moles of CO₂ is 1.264×10²⁴ molecules., option D is correct.
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Radio stations identify themselves by their position on the radio dial such as 90.1 and 93.3. This number is based on the number of waves or cycles that pass a fixed point in a specific unit of time. To which property of a wave does this identification number refer? A. frequency B. wavelength C. loudness D. amplitude
The property of a wave is given as frequency
What is the frequency?Generally, Frequency is simply defined as the number of waves that pass through a fixed point in a given amount of time
In conclusion, for a number based on the number of waves or cycles that pass a fixed point in a specific unit of time, we refer to it as frequency
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If 36 grams of aluminum react with an excess of oxygen, as shown in the balanced chemical equation below, how many grams of aluminum oxide can be formed? (1 point)
4Al + 3O2yields 2Al2O3
68 grams
24 grams
272 grams
18 grams
This reaction was monitored as a function of time:
AB --> A + B
A plot of 1/[AB] versus time yields a straight line with slope of -0.055/M*s.
a) What is the value of the rate constant (k) for this reaction t this temperature?
b) Write the rate law for the reaction.
c) What is the half-life when the initial concentration is 0.55M?
d) If the initial concentration of AB is 0.250M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75s?
a. The value of the rate constant (k) for this reaction at this temperature is 18.18 [tex]M^-1*s^-1.[/tex]
b. The rate law can be written as: ate = k[AB]
c. The half-life of the reaction when the initial concentration is 0.55 M is 0.038 seconds.
d. The concentrations of A and B after 75 seconds would be approximately 0.004 M each.
How to Write the rate law for the reaction.To answer the given questions, analyze the reaction kinetics based on the provided information:
a) The rate constant (k) can be determined from the slope of the plot 1/[AB] versus time. The slope is given as -0.055/M*s. The rate constant (k) can be calculated by taking the reciprocal of the slope:
k = -1/slope
k = -1/(-0.055/Ms)
k = 18.18 [tex]M^-1s^-1[/tex]
Therefore, the value of the rate constant (k) for this reaction at this temperature is 18.18 [tex]M^-1*s^-1[/tex].
b) The rate law can be determined using the given reaction:
AB --> A + B
Since the reaction is a first-order reaction, the rate law can be written as:
Rate = k[AB]
c) The half-life (t₁/₂) can be calculated using the first-order integrated rate law:
t₁/₂ = (0.693) / k
Given the initial concentration ([AB]₀) as 0.55 M and the rate constant (k) as 18.18 [tex]M^-1*s^-1[/tex], calculate the half-life:
t₁/₂ = (0.693) / (18.18 [tex]M^-1*s^-1[/tex])
t₁/₂ ≈ 0.038 s
Therefore, the half-life of the reaction when the initial concentration is 0.55 M is approximately 0.038 seconds.
d) To determine the concentrations of A and B after 75 seconds, use the first-order integrated rate law:
[AB] = [AB]₀ * exp(-kt)
Given:
[AB]₀ = 0.250 M (initial concentration of AB)
t = 75 s (time)
Using the rate constant (k) calculated earlier (18.18 [tex]M^-1*s^-1[/tex]), calculate the concentrations of A and B:
[AB] = 0.250 * exp(-18.18 [tex]M^-1*s^-1[/tex] * 75 s)
[AB] ≈ 0.004 M
Since the reaction is stoichiometrically 1:1, the concentrations of A and B after 75 seconds would be:
[A] ≈ 0.004 M
[B] ≈ 0.004 M
Therefore, the concentrations of A and B after 75 seconds would be approximately 0.004 M each.
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The rate constant is 0.055/M*s. The rate law is rate = k[AB]. The half-life is 10.5 seconds and the concentrations of A and B after 75 seconds can be calculated using the integrated rate equation.
Explanation:a) The slope of the line in the plot represents the rate constant (k) for this reaction. In this case, the slope is -0.055/M*s. So, the value of the rate constant is 0.055/M*s.
b) The rate law for the reaction can be determined by examining the stoichiometry of the reaction. The reaction is AB → A + B. Since the rate is expressed as 1/[AB], the rate law is rate = k[AB].
c) To find the half-life, we need to use the integrated rate equation ln([AB]₀/[AB]) = kt. Substituting the given values, we get ln(0.55/0.25) = (0.055/M*s)t. Solving for t, we find t = 10.5 seconds.
d) To find the concentrations of A and B after 75 seconds, we can use the integrated rate equation again. [A] = [AB]₀ - [AB]₀e^{-kt}. Plugging in the values, we get [A] = 0.250M - 0.250Me^{(-0.055/M*s)(75s)}. Similarly, we can find [B] = 0.250M - [A].
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Hi, I can't seem to answer the letter b.--> An empty vial weighs 55.32 g. (a) If the vial weighs 185.56 g when filled with liquid mercury (d 13.53 g/cm3), what is its volume? (b) How much would the vial weigh if it were filled with water (d 0.997 g/cm3 at 25°C)?,
The following chemical equation is not balanced: C3H8 + O2 CO2 + H2O When this chemical equation is correctly balanced, what is the coefficient of the carbon dioxide molecule?
3 would be the answer to your question...
A 10.0-L rigid container holds 3.00 mol H2 gas at a pressure of 4.50 atm. What is the temperature of the gas?
Answer. A. 183
B. 142
C. 0.03
D.11.3
E.24.5
Explanation:
Pls hurry!!
If the percent (mass/mass) for a solute is 4% and the mass of the solution is 200 g, what is the mass of solute in solution?
8.0 g
50 g
80 g
800 g
Answer : The correct option is, (a) 8.0 g
Solution : Given,
Percent of solute = 4 %
Mass of solution = 200 g
Mass by mass percent (m/m)% : It is defined as the mass of solute present in the mass of solution.
Formula used :
[tex](m/m)\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100[/tex]
Now put all the given values in this formula, we get the mass of solute.
[tex]4\%=\frac{\text{Mass of solute}}{200g}\times 100[/tex]
[tex]\text{Mass of solute}=8.0g[/tex]
Therefore, the mass of solute in solution is, 8.0 g
The smallest particle from among the following is
A. Li+
B. F
C. F-
D. Li
Which of the following represents a chemical change. A water to boiled
B Paper is torn
C Glass is shattered
D Wood is burned
to answer your second question, it is D
Calculate the number of joules released when 72.5 grams of water at 95.0 degrees Celsius cools to a final temperature of 28.0 degrees Celsius.
9.25 * 10^21 pennies if how many moles
Sodium ions are used by your body every time you move a muscle. The difference between the Na+ ions and atomic Na is that A) ionic sodium has one more electron. B) atomic sodium has one more electron. C) atomic sodium has one fewer electron. D) ionic sodium is only found in the body.
B) atomic sodium has one more electron.
This can be easily seen if you compare the charges - ionic sodium carries one more positive charge than atomic sodium, so ionic sodium must have one fewer electron.
if an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 mm in front of the lens what is the height of the image
The answer is 6mm
You're welcome!
How can you raise the average kinetic energy of the water molecules in a glass of water?
Final answer:
To rise the average kinetic energy of water molecules in a glass, you need to increase the water's temperature, which can be done by heating the water or increasing the room temperature. This is based on the principle that temperature is proportional to the average kinetic energy of the particles in a substance.
Explanation:
The average kinetic energy of water molecules in a glass can be raised by increasing the temperature of the water. This increase in temperature can be achieved in several ways, one of which is by increasing the temperature of the room, allowing heat energy to transfer from the environment to the water. It's important to note that replacing the water with a more dense fluid or adding more water will not increase the kinetic energy of the existing water molecules.
As detailed in the kinetic-molecular theory, temperature is directly proportional to the average kinetic energy of the particles in a substance. Thus, when water is heated, the molecules begin to move more rapidly, with more extensive vibrations and translations. This results in increased collisions between molecules and a higher average velocity and kinetic energy of the particles.
It's worth clarifying that kinetic energy is transferred from hot water molecules to colder substances like ice, but what we want in this scenario is to increase the kinetic energy of the water molecules themselves, which is done by applying heat to the water.
PLEASE HELP ASAP
In two or more complete sentences describe how atomic radius changes as you move down a group in the periodic table and why.
Answer:
When we move across the period from left to right then there is decrease in atomic radius.
This is due to increase in number of protons and electrons across a period. Since electrons are added in same energy level, therefore, they get pulled closer to the nucleus because of more number of protons which carry a positive charge.
As a result, there is shrinkage in size from left to right across the period.
Hope this helped!
Explanation:
The atomic radius increase as we move down the group in the periodic table because of the addition of a new principal shell.
What is the atomic radius?The atomic radius of an atom can be described as the shortest distance between the nuclei of the atom and the valence shell of the atom. An atomic radius is also specified as half the distance between two adjacent atoms of the same element directly bonded in a molecule.
In general, the atomic radius of an atom increases when we move down a group on the modern periodic table. In groups in the periodic table, the addition of a new principle shell as we move down. Therefore the distance between the nucleus and the outermost shell increases and the electronegativity decreases and the atomic radius increases.
In periods in the periodic table, the electrons are in the same valence shell therefore the atomic number of elements increases within the same period. While moving from left to right, the effective nuclear charge increases.
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The loss of static energy electric charges move off an object is called
The loss of static energy as electric charges move off an object is called electric discharge.
Electric discharge can be defined as release and transmission of electricity through a medium in an applied electric field.
It results from the conducting path between two points of different electrical potential in the medium where the points are immersed.
A student made this model of a carbon dioxide molecule. its has one carbon atom and two oxygen atoms what is the correct way to write the chemical name of carbon dioxide
Answer:
The chemical name of carbon dioxide is [tex]CO_2[/tex].
Explanation:
[tex]C+2O\rightarrow CO_2[/tex]
In a model of carbon dioxide made by the student there are one carbon atom and two oxygen atoms which means that total atoms in the molecule of carbon-dioxide is three.
While writing the chemical name of the carbon dioxide we will first write the symbol of the electropositive atom and then electronegative atom:[tex]CO_2[/tex]
In which case are the two atoms different isotopes of the same element?
When a 10 mL graduated cylinder is filled to the 10 mL mark, the mass of the water was measured to be 9.925 g. If the density of water is taken to be 0.9975 g/mL, what is the percent error for the 10 mL of water,
The percent error for the 10 mL of water, given a measured mass of 9.925 g and a density of 0.9975 g/mL, is approximately 0.501%.
Explanation:To calculate the percent error for the 10 mL of water given the measured mass and the density of water, we can use the formula for percent error:
Percent Error = | (Experimental Value - Theoretical Value) / Theoretical Value | × 100%
The theoretical mass of 10 mL of water using the density 0.9975 g/mL is calculated as follows:
Theoretical Mass = Volume × Density = 10 mL × 0.9975 g/mL = 9.975 g
The experimental mass measured is 9.925 g. Now, applying the percent error formula:
Percent Error = | (9.925 g - 9.975 g) / 9.975 g | × 100% = |(-0.05 g) / 9.975 g| × 100% ≈ 0.501%
Therefore, the percent error for the measurement of 10 mL of water is approximately 0.501%.
a mixture of 10.0 g of Ne and 10.0 g AR have a total pressure of 1.6 atm. what is the partial pressure of Ne?
Actually I know the answer but I didn't know how they get 2/3
The partial pressure of Ne is [tex]\boxed{1.063{\text{ atm}}}[/tex].
Further Explanation:
Dalton’s law:
This law states that partial pressure of any gas is calculated by the multiplication of mole fraction and the total pressure of gas mixture.
The expression for partial pressure of a particular gas is,
[tex]{P_{{\text{gas}}}} = {X_{{\text{gas}}}} \cdot {P_{{\text{total}}}}[/tex] …… (1)
Where,
[tex]{P_{\text{gas}[/tex] is the partial pressure of the gas.
[tex]{P_{{\text{total}}[/tex] is the total pressure of the mixture.
[tex]{X_{{\text{gas}}}[/tex] is the mole fraction of gas.
The formula to calculate moles of component is as follows:
[tex]{\text{Moles of component}} = \dfrac{{{\text{Mass of component}}}}{{{\text{Molar mass of component}}}}[/tex] …… (2)
Substitute 10.0 g for mass of component and 20.179 g/mol for molar mass of component in equation (2) to calculate moles of Ne.
[tex]\begin{aligned}{\text{Moles of Ne}} &= \frac{{{\text{10}}{\text{.0 g}}}}{{{\text{20}}{\text{.179 g/mol}}}} \\ &= 0.4956{\text{ mol}} \\\end{aligned}[/tex]
Substitute 10.0 g for mass of component and 39.948 g/mol for molar mass of component in equation (2) to calculate moles of Ar.
[tex]\begin{aligned}{\text{Moles of Ar}} &= \frac{{{\text{10}}{\text{.0 g}}}}{{{\text{39}}{\text{.948 g/mol}}}} \\&= 0.2503{\text{ mol}} \\ \end{aligned}[/tex]
Total number of moles can be calculated as follows:
[tex]\begin{aligned}{\text{Total number of moles}} &= \left( {0.4956 + 0.2503} \right){\text{ mol}} \\ &= 0.7459{\text{ mol}} \\\end{aligned}[/tex]
The formula to calculate mole fraction of Ne is as follows:
[tex]{\text{Mole fraction of Ne}} = \dfrac{{{\text{Moles of Ne}}}}{{{\text{Total number of moles}}}}[/tex] …… (3)
Substitute 0.4956 mol for moles of Ne and 0.7459 mol for total number of moles in equation (3).
[tex]\begin{aligned}{\text{Mole fraction of Ne}} &= \frac{{{\text{0}}{\text{.4956 mol}}}}{{{\text{0}}{\text{.7459 mol}}}} \\&= 0.6644 \\\end{aligned}[/tex]
Substitute 0.6644 for [tex]{X_{{\text{gas}}}}[/tex] and 1.6 atm for [tex]{P_{{\text{total}}}}[/tex] in equation (1) to calculate partial pressure of Ne.
[tex]\begin{aligned}{P_{{\text{Ne}}}} &= \left( {0.6644} \right)\left( {1.6{\text{ atm}}} \right) \\&= 1.063{\text{ atm}} \\\end{aligned}[/tex]
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Answer details:
Grade: Middle School
Subject: Chemistry
Chapter: Gases and the kinetic-molecular theory
Keywords: partial pressure, mole fraction, Ne, Ar, moles, molar mass, mass, 1.063 atm, 1.6 atm, 0.6644, mole fraction of Ne.
If an atom loses a neutron, what happens? (4.10)
Answer:
Its mass is lowered, but it is still the same element.
Explanation:
It right
i only have 3 questions left for this, please help!!!!
QUESTION 3
Daughter atoms X and Y are formed from the fission of atom Z. Which of the following statements is true about X and Y?
The combined atomic mass of X and Y will be greater than the mass of atom Z.
The mass of element X will always equal the exact atomic mass of Z.
High temperatures are required to make atoms X and Y.
Atoms X and Y will have a smaller atomic mass than atom Z.
QUESTION 7
What is the type of material needed in nuclear power plants?
combustible
stable
fissile
low mass
3 points
QUESTION 8
Which of the following are properties of nuclear fission?
The energy produced is controllable.
It is the source of the sun’s energy.
The reaction requires high temperature conditions.
It is used in nuclear power plants.It is used in nuclear power plants.
Answer:
3: Atoms X and Y will have a smaller atomic mass than atom Z
7: Fissile
8: It is used in nuclear power plants
Explanation:
3
The process of nuclear fission is where one unstable atom (in this case atom Z) splits into two smaller atoms (atoms X and Y) and releases energy in the form of radiation.
Hence, the combined atomic mass of X and Y cannot be grater than the mass of atom Z, fission does not need to be at high temperatures to take place, and the mass of element X will never equal the mass of element Z.
7
In nuclear fission, the energy is produced by the decay of radioactive elements, and that energy can not be obtained by combustion. Stable elements will not undergo fission, and low mass elements tend to be very stable too.
8
The energy produced from nuclear fission is not always controllable, that is why disasters such as nuclear meltdowns happen, because the energy output cannot be controlled. The atoms in the sun undergo fusion, and not fission. Once again, nuclear fission does not require high temperatures (nuclear fusion does, hence why the sun has such a high temperature).
Look back at your data and your regression equation. (Sample data is shown to the right, with X= pressure and Y=volume.) click all statements that are true.
Answered.
Answer:
ALL are true
Explanation:
What describes the change in oxidation states of the following reaction?
2Cl- + F2 > 2F- + Cl2
a. Cl– reduces to Cl and F oxidizes to F–.
b. Cl– oxidizes to Cl and F reduces to F–.
d. Cl is the reducing agent and F– is the oxidizing agent.
Which
molecule has the same shape and hybridization as methane
Answer:
cfcl2
Explanation:edg
Describe the solid state according to the kinetic molecular theory
The kinetic molecular theory describes the solid state as composed of tightly packed particles that vibrate about fixed positions and are held together by strong intermolecular forces. This leads to solids having a defined shape and volume, and being less compressible compared to liquids and gases.
Solid State According to the Kinetic Molecular Theory
The kinetic molecular theory is a framework used to describe the behavior of matter in different states - solid, liquid, and gas. According to this theory, the solid state of matter is characterized by particles that are tightly packed together, often in a regular pattern. These particles have very little movement, primarily vibrating about fixed positions.
In the context of the kinetic molecular theory, intermolecular attractions are significant in the solid state, holding the particles closely to one another. This close packing and the limited movement of particles correspond to the low kinetic energy compared to gases. These properties explain why solids have a definite shape and volume, and why they are not easily compressible.
Focusing on the particles' behavior in solids, we understand that the restricted motion due to strong intermolecular forces results in the characteristic rigidity and structural stability of the solid state. Although the particles are in motion, it is minimal and does not allow for the particles to move past each other, unlike in liquids or gases.
Why does Tom Zambrano think that renewable energy science is a good choice for a career?
Answer:
There will many opportunities in the field of renewable energy science and engineering. It is an exciting field, with a lot of variety and room for new ideas.
Explanation:
Answer:Sample Response:
There will many opportunities in the field of renewable energy science and engineering. It is an exciting field, with a lot of variety and room for new ideas.
Explanation:
What did you include in your response? Check all that apply.
opportunities
exciting field
variety
room for new ideas
Temperature at which a substance goes from a solid to liquid
If horizontal layers of sedimentary rock have a vertical fault running through them, how might a geologist use relative dating to determine when the fault occurred ? Could scientists use absolute dating as well ? Why or why not ?
Answer:
Scientists will be able to use relative dating and absolute dating to determine when the failure occurred.
Explanation:
Scientists will be able to use relative dating, because it is the method capable of determining an order of events that occurred in the past by relating the rock with that failure to a rock without failure or with different failures, without the need to determine an absolute age of when the failure happened, however revealing a relative, approximate date.
It will also be possible to use absolute dating, which will give a more precise age on the fault present in the rock, using a chronological age that will be determined by observing the physical and chemical properties of the rock. This technique shows the age of the event in numbers, as opposed to relative dating.