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

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Molar mass represents what value?

  1. The amount of energy in a substance

  2. The volume of a substance

  3. The mass of a substance divided by the amount of that substance

  4. The number of moles in a substance

The correct answer is: The mass of a substance divided by the amount of that substance

Molar mass is defined as the mass of a substance divided by the number of moles of that substance. Specifically, it indicates how much one mole of a given substance weighs, usually expressed in grams per mole (g/mol). This value is crucial in chemistry because it allows scientists and students to convert between the mass of a substance and the number of moles, facilitating stoichiometric calculations in chemical reactions and understanding the relationships between different reactants and products. The other options do not accurately define molar mass: the amount of energy in a substance pertains to thermodynamics rather than mass; the volume of a substance relates to how much space it occupies, which is distinct from mass; and the number of moles in a substance refers simply to the quantity of entities (atoms or molecules) but does not convey the relationship of mass to moles that defines molar mass.

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