Question

What is the molar mass of ammonia (NH₃)?

1) 15 g/mol
2) 17 g/mol
3) 42 g/mol
4) 43 g/mol

Answer 1

The molar mass of ammonia (NH3) is the sum of the molar masses of nitrogen and three atoms of hydrogen, which totals approximately 17 g/mol.

Step-by-step explanation:

The molar mass of ammonia (NH3) can be calculated by adding the molar mass of nitrogen (N) to the molar mass of 3 atoms of hydrogen (H). The molar mass of nitrogen is 14.01 g/mol and the molar mass of hydrogen is 1.01 g/mol per atom. Therefore, the molar mass of ammonia is:

14.01 g/mol (nitrogen) + 3 × 1.01 g/mol (hydrogen) = 17.04 g/mol

However, when we round to the nearest whole number, the molar mass of ammonia is approximately 17.04 g/mol So, the correct answer to the question is option 2) 17.04 g/mol