Question

Which has more atoms: 17.031 grams of ammonia, NH3, or 72.922 grams of hydrogen chloride, HCl?

Answer 1

Hydrogen Chloride (HCl) has more atoms

Answer 2

NH3 has molecular weight of 17g and 1 mole of any molecule consist of 6.022 ×10^23 atoms and 1 mole of NH3 =17g so it has 6.022×10^23 molecules....

But Hcl atomic weight is 36.5g and 1 mole of it consist 6.022 ×10^23..

so 1g has 6.022 ×10^23 /36.5 atoms and 72.9 g has 6.022 ×10^23 × 72.9/36.5 = 2 ×6.022 ×10^23 = 12.044 × 10^23 atoms...

I had used approx values..my main concern is to get you the topic.... I hope it helps....