First slide

laws

Question

An open vessel contains a gas at 60°C. To what temperature should the gas be heated so that 1/4^th of the mass of gas is expelled ?

Moderate

A

444°C
B

273°C
C

171°C
D

333°C

Solution

Open vessel P and V constant
$\begin{array}{l} m \propto T^{- 1} \frac{m_{1}}{m_{2}} = \frac{T_{2}}{T_{1}} \\ \frac{m}{3 m / 4} = \frac{T_{2}}{333} \\ T_{2} = \frac{333 \times 4}{3} = 444 K = 171^{\circ} C \end{array}$

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