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Question
Calculate the following:
The volume at s.t.p. occupied by a gas ‘Q’ originally occupying 153.7 cm3 at 287K and 750 mm. pressure [vapour pressure of gas ‘Q’ at 287K is 12 mm of Hg.]
Solution
Initial conditions
V1 = 153.7 cm3
P1 = 750 mm - 12 mm = 738 mm
T1 = 287 K
Final conditions
V2 = ?
P2 = 760 mm
T2 = 273 K
Using gas equation `("P"_1"V"_1)/"T"_1 = ("P"_2"V"_2)/"T"_2`
Substituting the values
`(738 xx 153.7)/287 = (760 xx "V"_2)/273`
V2 = `(738 xx 153.7 xx 273)/(287 xx 760)`
V2 = `(30,966,553.8)/(218,120)`
V2 = 141.970 cm3
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