What is the molar mass of diazepam (Valium®) if 0.05570 mol weighs 15.86 g? Express your answer using four significant figures.

284.74 g/mol

Explanation:

Molar mass is defined as the mass of 1 mole of the substance. The units for molar mass is g/mol.

Given that:

0.05570 mol of diazepam has a mass of 15.86 g

To calculate : Molar mass

As stated above, molar mass is mass of 1 mole.

So,

1 mole of diazepam has a mass of 15.86/0.05570 g

Thus, molar mass of diazepam = 284.74 g/mol