A sample of TNT, C7H5N3O6, has 8.94 * 1021 nitrogen atoms. How many hydrogen atoms are there in this sample of TNT?

1.49*10²² atoms of H are contained in the sample

Explanation:

TNT → C₇H₅N₃O₆

1 mol of this has 7 moles of C, 5 moles of H, 3 moles of N and 6 moles of O

Let's determine the mass of TNT.

Molar mass is = 227 g/mol

As 1 mol has (6.02*10²³) NA atoms, how many moles are 8.94*10²¹ atoms.

8.94*10²¹ atoms / NA = 0.0148 moles

So this would be the rule of three to determine the mass of TNT

3 moles of N are in 227 g of compound

0.0148 moles of N are contained in (0.0148.227) / 3 = 1.12 g

Now we can work with the hydrogen.

227 grams of TNT contain 5 moles of H

1.12 grams of TNT would contain (1.12.5) / 227 = 0.0247 moles

Finally let's convert this moles to atoms:

0.0247 mol. 6.02*10²³ atoms / 1 mol = 1.49*10²² atoms