The molar mass of a molecule will be equal to the sum of the atomic mass. We have 3 atoms of hydrogen and 1 atom of nitrogen. So the molar mass will be:
Aatomic mass of H = 1.00784 g/mol
Atomic mass of N = 14.0067 g/mol
Total molar mass= Atomic mass of H x Number of mol of H + Atomic mass of N x Number of mol of N
Total molar mass= 1.00784 x 3 + 14.0067 x 1 = 17.0 g/mol
The molar mass of Ammonia rounded to the nearest whole number is c) 17.0 g/mol
