Chapter 10, Problem 38E

The simplest example of the hydrogenation of a carbon-carbon double bond is the reaction between ethene and hydrogen in the presence of nickel: ${\text{CH}}_{\text{2}}={\text{CH}}_{\text{2}}+{\text{H}}_{\text{2}}\stackrel{\text{Ni}}{\to }{\text{CH}}_{\text{3}}{\text{CH}}_{\text{3}}$. When $5.20\text{g}$ of ethene react with excess hydrogen gas, the reaction yields $4.75\text{g}$ of ethane. What is the percentage yield for this reaction?