# Chapter 18 - Exercises and Problems - Page 331: 29

57.7 percent

#### Work Step by Step

We know that the value of gamma is given by the following fraction: $1.52 =\frac{7(1-n)+5n}{4(1-n)}$ Where n is the fractional percent of the molecules that are monotomic. Thus, it follows: $7-2x=7.6-3.04x$ $x=.577$ Thus, the percentage is: $\fbox{57.7 percent}$.

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