Question

A sample of H2O contains 7.2 x 10 24 atoms. How many moles of water are in this sample?
Responses

6.02 moles
6.02 moles

11 moles
11 moles

12 moles
12 moles

7.2 moles

Answer 1

To determine the number of moles in a sample, you can use Avogadro's number, which states that there are 6.02 x 10^23 atoms in one mole of a substance.

Given that the sample contains 7.2 x 10^24 atoms, you can calculate the moles by dividing the number of atoms by Avogadro's number:

7.2 x 10^24 atoms / 6.02 x 10^23 atoms/mol = 12 moles

Therefore, the correct answer is 12 moles.