The mass of one mole of a substance in grams is called ....... .
The mass of one mole of a substance in grams is called ....... .
atomic mass
mole number
molar mass
mass number
Solution
The mass of one mole of a substance in gram is called its molar mass. Molar mass is an average of many instances of the compound, which often very in mass due to the presence of isotopes. Hence, option (3) is correct.