Question

How much percentile of propane is present in natural gas?

(a) 5.5 %

(b) 3.7 %

(c) 1.8 %

(d) 0.5 %

The question was asked during an internship interview.

The origin of the question is Gaseous Fuels in section Fuels and Combustion of Engineering Chemistry II

Answer 1

Right option is (b) 3.7 %

Easy explanation: At an average 88.5 % of methane is present in natural gas. 5.5 % of ethane, 3.7 % of propane and 1.8 % of butane are present in natural gas. The higher hydrocarbons are present at about 0.5 %.