Question

Which two phrases correctly describe uses of the concept of moles?

A. To convert chemical amounts to masses
B. As a tool to balance chemical equations
C. To determine chemical formulas in chemical equations
D. To calculate with mass instead of chemical amounts

Answer 1

The two phrases that correctly describe uses of the concept of moles are:

A. To convert chemical amounts to masses
D. To calculate with mass instead of chemical amounts

The concept of moles is used in chemistry to convert between the amount of a substance (measured in moles) and its mass (measured in grams) using the substance's molar mass. It is also used to perform calculations involving mass instead of chemical amounts when dealing with chemical reactions and stoichiometry.