Eicosane, C20H42\text{C}_{20}\text{H}_{42}C20H42, is a long-chain alkane found in the heavy distillate fraction of crude oil.
Complete the equation for the catalytic cracking of one molecule of C20H42\text{C}_{20}\text{H}_{42}C20H42 to form three molecules of propene (C3H6\text{C}_3\text{H}_6C3H6) and one molecule of another hydrocarbon, ZZZ.
C20H42→3C3H6+... \text{C}_{20}\text{H}_{42} \rightarrow 3\text{C}_3\text{H}_6 + \text{...} C20H42→3C3H6+...Explain whether hydrocarbon ZZZ is saturated or unsaturated.
An organic sulfur-containing impurity found in crude oil supplies has a relative molecular mass (MrM_rMr) of 120.2120.2120.2. It contains carbon, hydrogen, and sulfur atoms in a 2:4:12:4:12:4:1 ratio. Determine the molecular formula of this impurity. [Relative atomic masses: H=1.0,C=12.0,S=32.1\text{H} = 1.0, \text{C} = 12.0, \text{S} = 32.1H=1.0,C=12.0,S=32.1]
