Find the Number of Molecules in the Given Quantity of a Compound

Multiple Choice

Find the number of molecules in the given quantity of a compound whose molar mass is given. Express your answer in scientific notation, rounding the decimal part to the nearest hundredth.
-50 grams of carbon monoxide (CO) ; molar mass: 28.01 grams

A) $1.07 \times 10^{23}$ molecules
B) $8.43 \times 10^{26}$ molecules
C) $8.43 \times 10^{27}$ molecules
D) $1.07 \times 10^{24}$ molecules