IMAT 2013 Q52 [Atoms]

How many atoms of hydrogen are there in 3.0kg of ethane?

[relative atomic mass: H=1, C=12; Avogadro constant = 6.0 × 10^{23} per mol]

A. 3.6 × 10^{26}
B. 3.9 × 10^{26}
C. 6.0 × 10^{25}
D. 3.6 × 10^{23}
E. 6.0 × 10^{22}