How many atoms are in 20.6g of N2O4 gas at STP?

  • Thread starter fish
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In summary, N2O4 is a gas that contains 6 atoms per molecule. When calculating the number of atoms, you can use the conversion factor of 1 molecule/6 atoms. This can be applied to the given information of 1 mol/22.4L * 6.02x10^23 molecules/1 mol * 5.02L to determine the number of molecules. However, it is important to note that molecules and atoms are not always interchangeable, as they have different properties and behaviors. Therefore, in order to accurately calculate the number of atoms, it is necessary to use the conversion factor of 1 molecule/6 atoms.
  • #1
fish
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Gas is N2O4.
fill in the chart. I've got all but atoms.

how do I get the # of atoms?
why wouldn't it be the same as molecules:
1 mol/22.4L * 6.02x10^23 molecules/1 mol * 5.02L
= 1.35x10^23 molecules
molecules of are: 1.35x10^23
why couldn't I just replace the word 'molecules' with atoms
ie, 6.02x10^23 atoms in the above conversion and get
the same answer?

molecules: 1.35x10^23
Atoms: ? how do you set this up?
Mass: 20.6g
Vol at STP: 5.02L

answer from book is 8.10x10^23 atoms
 
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  • #2
1 molecule of N2O4 contains 6 atoms (assume that all of the bonds are covalent).

6 * Your Answer = Their Answer
 
  • #3
cool :smile:
 
  • #4
Happy to help. :smile:
 

1. How do you calculate the number of atoms in N2O4?

The number of atoms in N2O4 can be calculated by using Avogadro's number, which is equal to 6.022 x 10^23. Count the number of nitrogen (N) and oxygen (O) atoms present in the molecule and multiply them by Avogadro's number. In N2O4, there are 2 nitrogen atoms and 4 oxygen atoms, so the total number of atoms is (2 x 6.022 x 10^23) + (4 x 6.022 x 10^23) = 1.2044 x 10^24 atoms.

2. What is the formula for calculating the number of atoms in a compound?

The formula for calculating the number of atoms in a compound is to first determine the number of each type of atom present in the molecule. Then, multiply the number of each atom by its respective atomic mass and add them together to get the total molar mass. Finally, divide the total molar mass by Avogadro's number (6.022 x 10^23) to get the number of atoms.

3. Can the number of atoms in a compound change in different environments?

No, the number of atoms in a compound is a constant value and does not change in different environments. However, the arrangement and behavior of the atoms may change depending on the conditions.

4. Is there a difference in calculating atoms for a diatomic versus a polyatomic molecule?

Yes, the method for calculating the number of atoms in a diatomic molecule, such as N2, is different from a polyatomic molecule, such as N2O4. In a diatomic molecule, there are only 2 atoms present, so the number of atoms can be determined by simply multiplying the number of molecules by 2. In a polyatomic molecule, there are more than 2 atoms present, so Avogadro's number must be used to calculate the total number of atoms.

5. How is calculating the number of atoms in a compound useful in scientific research?

Calculating the number of atoms in a compound is useful in scientific research because it gives insight into the composition and properties of the compound. It can also be used to determine the amount of a specific element present in a sample, which is important for understanding chemical reactions and developing new materials.

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