Q. 11.74 - An Introduction to General, Organic, and Biological Chemistry

Question

Margarines are produced from the hydrogenation of vegetable oils, which contain unsaturated fatty acids. How many grams of hydrogen are required to completely saturate $75.0$g of oleic acid, ${\mathrm{C}}_{18}{\mathrm{H}}_{34}{\mathrm{O}}_2$which has one double bond?

Step-by-Step Solution

Answer

The amount of hydrogen required will be $0.53g$.

Step 1: Given Information

We are given the amount of oleic acid and we have to find out how many hydrogen atoms are required to completely saturate the oleic acid.

Step 2: Explanation

As the$75.0 g$ of oleic acid is given which means,

$Number of moles=\frac{Given mass}{Molar mass}=\frac{75.0}{282.46}$

which gives moles are$0.265$.

Now, for one double bond, we require one mole of ${\mathrm{H}}_2$

which states that $0.265$moles of oleic acid require a $0.265$mole of $H_2$.

given mass = $0.265\times 2=0.53$g

Hence, $0.53g$of hydrogen is required.