Question

question 20 (5 points)
molar mass is reported on the periodic table in the units
a) atoms/gram.
b) kg/m³.
c) grams/mole.
d) moles/gram.

Explanation:

Molar mass is defined as the mass of one mole of a substance. On the periodic table, the molar mass of an element (in grams per mole) is numerically equal to its atomic mass in atomic mass units. Option A (atoms/gram) is incorrect as it relates to number of atoms per mass, not molar mass. Option B (kg/m³) is a unit of density, not molar mass. Option D (moles/gram) is the reciprocal of molar mass (it would be related to 1/molar mass, like mole fraction per gram, but not molar mass itself). Option C (grams/mole) matches the definition of molar mass, as it's the mass (in grams) of one mole of the substance.

Answer:

C. grams/mole