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Question
50 cm3 of hydrogen is collected over water at 17°C and 750 mmHg pressure. Calculate the volume of a dry gas at STP. The water vapour pressure at 17°C is 14 mmHg.
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Solution
V = 50 cm3
P = 750 - 14 = 736 mm
T = 290 K
P1 = 760 mm
V1= ?
T1 = 273 K
Using gas equation,
`("P" "V")/"T" = ("P"_1 "V"_1)/"T"_1`
`(736 xx 50)/290 = (760 xx "V"_1)/273`
`"V"_1 = 45.6 "cm"^3`
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