Question

A flask containing air (open to the atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is

• A. 16.6
• B. 40
• C. 60
• D. 20

Answer 1

Answer: (B)

40

Answer 2

At constant pressure $\frac{V_1}{T_1} = \frac{V_2}{T_2}$ or $\frac{V}{300} = \frac{V_2}{500}$ $\therefore \, V_2$ = 5/3 V Volume of air escaped = 5/3 V - V = 2/3 V $\therefore$ % of air escaped = $\frac{2/3V}{5/3V} \times$ 100 = 40%