A substance has a molar mass of 58.5 g/mol and you have 3.00 moles. What is the mass?

A substance has a molar mass of 58.5 g/mol and you have 3.00 moles. What is the mass?

• A. 88.5 g
• B. 117.0 g
• C. 175.5 g
• D. 3.00 g

Answer: (C)

Mass is found by multiplying the amount in moles by the molar mass, because molar mass is the mass per one mole. So with 3.00 moles and a molar mass of 58.5 g/mol, the mass is 3.00 × 58.5 = 175.5 g. The units become grams since moles cancel. Therefore the mass is 175.5 g.

Mass is found by multiplying the amount in moles by the molar mass, because molar mass is the mass per one mole. So with 3.00 moles and a molar mass of 58.5 g/mol, the mass is 3.00 × 58.5 = 175.5 g. The units become grams since moles cancel. Therefore the mass is 175.5 g.