IMAT 2012 Q63 [Hydrogen Atoms]

The Avogadro constant is {6.0\times 10^{23} mol^{-­1}}.
How many hydrogen atoms are there in 0.420 g of cyclohexane?
[Ar: H = 1; C = 12]

A. 1.8\times 10^{23}
B. 1.8\times 10^{22}
C. 3.0\times 10^{21}
D. 3.0\times 10^{22}
E. 3.6\times 10^{22}