During the catalytic cracking of a heavy crude oil fraction, one molecule of pentadecane, C15H32\text{C}_{15}\text{H}_{32}C15H32, is broken down into one molecule of propene, C3H6\text{C}_3\text{H}_6C3H6, two molecules of ethene, C2H4\text{C}_2\text{H}_4C2H4, and one molecule of product ZZZ.
C15H32→C3H6+2C2H4+product Z \text{C}_{15}\text{H}_{32} \rightarrow \text{C}_3\text{H}_6 + 2\text{C}_2\text{H}_4 + \text{product } Z C15H32→C3H6+2C2H4+product ZWhat is the molecular formula of product ZZZ?
C8H16\text{C}_8\text{H}_{16}C8H16
C10H22\text{C}_{10}\text{H}_{22}C10H22
C8H18\text{C}_8\text{H}_{18}C8H18
C7H16\text{C}_7\text{H}_{16}C7H16
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