Question

define the term \molar mass.\ select one: the reactant in the least amount that can be used in the reaction a chemical compound contains exactly the same proportion of elements by mass the mass in grams of one mole of atoms or molecules of that compound a grouped counting term used to group 6.022 x 10^23 things together

Explanation:

To define molar mass, we analyze each option:

• "the reactant in the least amount..." refers to limiting reactant, not molar mass.
• "a chemical compound contains..." describes percent composition or empirical formula concepts, not molar mass.
• "a grouped counting term..." is Avogadro’s number or mole concept, not molar mass.
• "the mass in grams of one mole..." matches the definition of molar mass (mass of one mole of a substance, in grams, equal to its atomic/molecular/formula mass in atomic mass units).

Answer:

the mass in grams of one mole of atoms or molecules of that compound