Question

How many molecules (not moles) of NH3 are produced from 1.60×10−4 g of H2?

Express your answer numerically as the number of molecules.

Answer 1

N2 + 3H2 ---------------- 2 NH3

Molar mass of H2 = 2 grams/mole

molar mass of NH3= 17 grams/mole

According to equation

3x2 grams of H2 produces 2x 6.023 x10^23 molecules of NH3

1.60x10^-4 grams of H2 produces ?

                                           = 2x 6.023x10^23x1.60x10^-4/3x2= 3.21x10^19 molecules of NH3

number of molecules of NH3 = 3.21x10^19 molecules.