Q.

A quantity of gas is collected in a graduated tube over the mercury. The volume of gas at l8°C is 50.0 mL and the level of mercury in the tube is 100 mm above the outside mercury level. The barometer reads 750 torr. Hence, volume at STP is approximately

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a

22 mL

b

40 mL

c

20 mL

d

44 mL

answer is B.

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Detailed Solution

Under given condition, pressure = 750 - 100 = 650 Torrp1V1T1=p2V2T2,650×50291=760×V2273 ∴ V2=40.1mL
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A quantity of gas is collected in a graduated tube over the mercury. The volume of gas at l8°C is 50.0 mL and the level of mercury in the tube is 100 mm above the outside mercury level. The barometer reads 750 torr. Hence, volume at STP is approximately