Question

What is the molar mass of Ammonia gas, NH3(g), rounded to the nearestwhole number.a) 17.04 g/molb) 15.0 g/molc) 17.0 g/mold) 4.0 g/mol

Answer 1

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