A Sample Of $\mathrm{CO}_{2}$ Has a Mass of 50 $\mathrm{C}=12.0 \mathrm{u}, \mathrm{O}=16.0 \mathrm{u}$

Multiple Choice

A sample of $\mathrm{CO}_{2}$ has a mass of 50.0 grams. What is number of molecules of carbon dioxide in the sample? ( $\mathrm{C}=12.0 \mathrm{u}, \mathrm{O}=16.0 \mathrm{u}$ , and $1 \mathrm{u}=1.66 \times 10^{-27} \mathrm{~kg}$ .)

A) $6.85 \times 10^{23}$
B) $4.95 \times 1023$
C) $5.66 \times 1023$
D) $4.02 \times 1023$
E) $6.02 \times 10^{23}$