Question

What is the molar mass of a substance?

a. the mass in grams of one mole of a substance
b. the number of particles in one gram of a substance
c. the number of moles in one gram of a substance
d. the mass in grams of one particle of a substance

Answer 1

Molar mass also called Atomic mass is the atomic weight. You can find this on the periodic table.
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The answer would be
A. the mass in grams of one mole of a substance

Answer 2

Answer: Option (a) is the correct answer.

Explanation:

Molar mass is defined as the mass in grams of one mole of a substance.

Mathematically,       Molar mass = $\frac{mass in grams}{moles of substance}$

For example, molar mass of 1 mole of $CH_{4}$ molecule will be calculated as follows.

             Molar mass of $CH_{4}$ = $mass of carbon atom + 4 \times mass of hydrogen atom$

                                 = $12 + 4 \times 1$

                                 = 16 g

Therefore, 1 mole of $CH_{4}$ molecules has a molar mass of 16 g.