Question

question 3 of 10
what is the molar mass of a compound?

a. the mass in grams of 1 mole of the compound
b. the number of moles in a molecular formula
c. the number of moles in 1 g of the compound
d. the number of atoms in 1 mole of the compound

Explanation:

To determine the correct option, we analyze the definition of molar mass. Molar mass is defined as the mass (in grams) of one mole of a substance (compound, element, etc.). Let's evaluate each option:

• Option A: Matches the definition of molar mass (mass in grams of 1 mole of the compound).
• Option B: The number of moles in a molecular formula is not related to molar mass; it refers to the ratio of atoms in the formula.
• Option C: The number of moles in 1 g of the compound is the reciprocal of molar mass (1/molar mass), not molar mass itself.
• Option D: The number of atoms in 1 mole of a compound is related to Avogadro's number and the formula of the compound (e.g., for \(H_2O\), 1 mole has \(3\times6.022\times10^{23}\) atoms), not molar mass.

Answer:

A. The mass in grams of 1 mole of the compound