Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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Which of the following accurately defines the concept of molar mass?

Mass per mole of a compound
Total mass of an ionic compound
Mass of a substance divided by its density
Number of molecules in a mole

The correct answer is: Mass per mole of a compound

The concept of molar mass is accurately defined as the mass per mole of a compound. This means that molar mass quantifies how much one mole of a substance weighs, expressed in grams per mole (g/mol). This measurement is essential in chemistry as it allows for the conversion between the mass of a substance and the amount of substance in terms of moles, which is a fundamental unit in chemistry for calculating quantities in reactions and understanding stoichiometry. Molar mass is derived from the atomic masses of the elements in a compound according to its chemical formula and can help in determining the mass needed for a particular reaction or the amount to be produced. It provides an intuitive way to relate mass to molecular quantities, facilitating calculations in both theoretical and practical laboratory settings.