Question

The `u_(rms)` of a gas at `300K` is `3R^(1//2)` The molar mass of the gas in `kg mo1^(-1)` is .
A. `1.0 xx 10^(-1)`
B. `1.0 xx 10^(-2)`
C. `1.0 xx 10^(-3)`
D. `1.0`

Answer 1

`u_(rms) = sqrt((3RT)/(M))`
`:. 3R^(1//2)=sqrt((3RT)/(M))`
or `M = (3xxR xx 300)/(R xx 3 xx3) = 100g mo1^(-1)`
`=10^(-1) kg mo1^(-1)` .