Discussion
How many moles are there in 88 grams of carbon dioxide, whose molar mass is 44 grams per mole?
Answer: B
Correct answer: 2
\[ \frac{88\ \mathrm{g}}{44\ \mathrm{g/mol}} = 2\ \mathrm{mol}. \] Dividing mass by molar mass gives moles, and the units confirm it - grams over grams per mole leaves moles. Multiplying instead would give 3872 with the meaningless units of grams squared per mole.
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