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3 Easy Mole questions (SHOW CALCULATIONS CLEARLY)

Chemistry
Tutor: None Selected Time limit: 0 Hours

1-How many atoms of nitrogen are in 1.00 mole of nitrogen gas?

2-How many molecules of oxygen are in 1.00 mole of Oxygen gas?

3-how many grams of iron do you have in 1.00 of iron?

Mar 19th, 2015

  •  6.02 * 10^23 atoms of nitrogen in one mole of nitrogen gas but nitrogen gas is diatomic so multiply it by 26.02*10^23 * 2

  • 1 mole of a substance contains Avogadro's number of molecules . This number is 6.02 *10^23, therefore one mole of oxygen gas contains 6.02*10^23 molecules
  • One mole of iron weighs 58.85 grams which is the answer

Mar 19th, 2015

Thank you!

But can you further elaborate on the first 2 questions?

Oxygen and Nitrogen are both diatomic so the 1 Mole of each should be doubled. In other words you would need to multiply Avogadros number by 2 which would equal approximately 12.044*10^23.

Thanks again.

Mar 19th, 2015

Yes that is right one mole of any element has a mass in grams which is equal to its atomic number and has exactly 6.02*10^23 atoms. Oxygen and Nitrogen are both diatomic so we will multiply Avogadros number by 2

Mar 19th, 2015

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