How many hydrogen atoms are there in a 346 g sample of pure ammonia (NH₃)?

Question

Quizplus · Accepted Answer

1. Calculate the number of moles of NH3 in the sample:
m = 346 g
Molar mass of NH3 = 14.01 + 3(1.01) = 17.04 g/mol
n = m/M = 346/17.04 = 20.3 mol

2. Since NH3 has three H atoms for each molecule, the total number of hydrogen atoms is:
Number of hydrogen atoms = 3 x number of NH3 molecules
Number of NH3 molecules = n x Avogadro's number
Number of hydrogen atoms = 3 x n x Avogadro's number = 3 x 20.3 x 6.022 x 10^23 = 3.67 x 10^25

Therefore, the answer is A) 3.67 x 10^25 atoms.

How Many Hydrogen Atoms Are There in a 346 G