6. Stoichiometry (Chemical Calculations) and the Mole Concept
1. (D) The molar mass of a compound is found by adding the masses of the
individual elements in the compound based on the subscripts associated with
that element in the formula. In this case, the formula for carbon monoxide is
CO. The molar mass of carbon is 12.0 grams and that of oxygen is 16.0 g.
Therefore, the molar mass of carbon monoxide is 28.0 g. The masses in the
answers expressed in amu would be appropriate for 1 molecule of a
substance, not for 1 mole.
