A sample of ammonia, NH3, has a mass of 56.6 grams. Calculate the number of hydrogen atoms present in this sample.

Question

A sample of ammonia, NH₃, has a mass of 56.6 grams. Calculate the number of hydrogen atoms present in this sample. 

Answers"

6.67 x 10²³

5.44 x 10²³

6.00 x 10²⁴

2.00 x 10²⁴

Answer 1

Using dimensional analysis:

56.6 g NH₃ x 1 mol NH₃/17 g x 6.02x10²³ molecules NH₃/mol NH₃ x 3 H atoms/molecule = 6.00 x 10²⁴ atoms