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Question
Calculate the following:
A gas ‘X’ is collected over water at 17°C and 750 mm. pressure. If the volume of the gas collected is 50 cc., calculate the volume of the dry gas at s.t.p. [at 17°C the vapour pressure is 14 mm.]
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Solution
Initial conditions
T1 = 17 + 273 = 290 K
P1 = 750 mm - 14 mm
V1 = 50 c.c
Final conditions
T2 = 273 K
P2 = 760 mm
V2 = ?
Using gas equation `("P"_1"V"_1)/"T"_1 = ("P"_2"V"_2)/"T"_2`
∴ V2 = `("P"_1"V"_1"T"_2)/("T"_1"P"_2)`
`= (736 xx 50 xx 273)/(290 xx 760) = 45.58`
⇒ 45.6 cc
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