Question

1 L flask contains nitrogen along with a drop or two of water at ${40}^{\circ }C$, the total pressure is 760 torr. If all the contents are transferred to another flask of 0.5 L at the same temperature, the pressure set up in the second flask will be (aqueous tension at ${40}^{\circ }C=55torr)$

• A. 1410 torr
• B. 1465 torr
• C. 1520 torr
• D. None of these

Answer 1

The correct option is B

1465 torr

$P_1\left(dry\right)\times V_1=P_2\left(dry\right)\times V_2;P_1=P_{wet}-aqueoustension=760-55=705torr$
$V_2=0.5L,$ Hence, $P_2$ (dry gas) $=\frac{705\times 1}{0.5}=1410torr$
$P_2$ (Wet gas) $=1410+55=1465torr$