Question

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NO3)2?

Answer 1

When there is a suffix outside a parenthesis, it multiplies every atom inside the parenthesis. so since in nitrogen is inside the parenthesis with a 2 as a suffix, it means there are 2 nitrogens

2 x 14.01= 28.02 g/mol

Answer 2

In one mole of cadmium nitrate there are 2 moles of nitrogen atoms. So the mass of nitrogen in 1 mole of the compound is 2 x 14.01 = 28.02 g