Question

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

• A. 16.6
• B. 40
• C. 66
• D. 20

Answer 1

Answer: (C)

66

Answer 2

$\frac { V _ { 1 } } { T _ { 1 } } = \frac { V _ { 2 } } { T _ { 2 } }$ i.e. $\frac { V _ { 1 } } { 300 } = \frac { V _ { 2 } } { 500 }$ ; $V _ { 2 } = \frac { 5 } { 3 } V = 1.66 \mathrm {~V}$

Volume escaped $= 1.66 V - V = 0.66 V = 66 \%$ of V