Question

Which of the following best defines molar mass?

A. the mass of a mole of moles

B. the mass of one molecule of a substance

C. the mass of one atom of a substance

D. the mass of one mole of a substance

Answer 1

D. the mass of one mole of a substance

Step-by-step explanation:

The molar mass of a substance is the mass in grams of one mole of the substance.

• For an element, the molar mass is the relative atoms mass expressed in grams.
• For example 23g of Na, 40g of oxygen
• For compounds, molar mass is the gram -formula or gram - molecular weight.
• This is determined by the addition of its component atomic masses and then expressed in grams.