Discussion
One molecule of pentane has :
Answer: B
One molecule of pentane has 12 hydrogen atoms.
Pentane is an alkane, and alkanes follow the general formula CnH2n+2. With five carbon atoms:
\[ 2n + 2 = 2(5) + 2 = 12 \]
so the formula is C5H12, CH3CH2CH2CH2CH3 for the straight chain.
5 is the number of carbon atoms, not hydrogens. 17 is the total number of atoms in the molecule (5 + 12), and 9 does not follow from any alkane formula.
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