Question

An open flask containing air is heated from 300 $K$ to 500 $K$. The % of air escaped to the atmosphere is :

• A. 20
• B. 40
• C. 60
• D. 80

Answer 1

The correct option is B 40

Given, $nT=n^{\prime }{T}^{\prime }$

$300n=500n^{\prime }$

$n^{\prime }=0.6n$

By putting this value, we get-
The percentage of air escaped to atmosphere is $\frac{n-0.6n}{n}\times 100=40$%

So, the correct option is $B$