Which of the following units is commonly used to express molar mass?

Which of the following units is commonly used to express molar mass?

• A. g/mL
• B. g/mol
• C. mol/L
• D. mL/g

Answer: (B)

Molar mass is expressed in grams per mole (g/mol), which represents the mass of one mole of a substance. This unit allows scientists and chemists to relate the mass of a substance to the amount of substance in moles, which is essential for stoichiometric calculations in chemical reactions. When calculating molar mass, one typically adds the atomic masses of all the atoms in the chemical formula of the compound. The result gives the weight of one mole of that substance, making g/mol the appropriate and widely accepted unit for this measurement. The other units listed do not accurately represent molar mass: grams per milliliter (g/mL) is a unit for density, moles per liter (mol/L) is a unit for concentration, and milliliters per gram (mL/g) would indicate a volume-to-mass ratio, neither of which pertains to molar mass.

Molar mass is expressed in grams per mole (g/mol), which represents the mass of one mole of a substance. This unit allows scientists and chemists to relate the mass of a substance to the amount of substance in moles, which is essential for stoichiometric calculations in chemical reactions.

When calculating molar mass, one typically adds the atomic masses of all the atoms in the chemical formula of the compound. The result gives the weight of one mole of that substance, making g/mol the appropriate and widely accepted unit for this measurement.

The other units listed do not accurately represent molar mass: grams per milliliter (g/mL) is a unit for density, moles per liter (mol/L) is a unit for concentration, and milliliters per gram (mL/g) would indicate a volume-to-mass ratio, neither of which pertains to molar mass.