Question

The volume of a gas at 20°C is 200 ml. If the temperature is reduced to – 20°C at constant pressure, its volume will be

• A. 172.6 ml
• B. 17.26 ml
• C. 192.7 ml
• D. 19.27 ml

Answer 1

Answer: (A)

172.6 ml

Answer 2

$V \propto T$Ž $\frac{V_{1}}{V_{2}} = \frac{T_{1}}{T_{2}}$Ž$\frac{200}{V_{2}} = \frac{(273 + 20)}{(273 - 20)} = \frac{293}{253}$

Ž $V_{2} = \frac{200 \times 253}{293} = 172.6ml$