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ICSE Class 9 Answered

A gas 'X' is collected over warer at 17°C and 750mm pressure. If the volume of the gas collected is 50cc., calculate the volume of the dry gas at s.t.p.[at 17°C the vapour pressure is 14mm].
Asked by Karuna | 28 Dec, 2018, 12:16: PM
answered-by-expert Expert Answer
Given:
 
P1 = 750mm + VP
 
    = 750 + 14

P1 = 764 mm Hg
 
V1 = 50cc.
 
T1 = 17°C
 
    = 290 K
 
At STP;

 
P2 = 760 mm Hg
 
V2 =
 
T2 = 273 K
 
By using the gas equation
 
fraction numerator straight P subscript 1 straight V subscript 1 over denominator straight T subscript 1 end fraction equals space fraction numerator begin display style straight P subscript 2 straight V subscript 2 end style over denominator begin display style straight T subscript 2 end style end fraction

straight V subscript 2 space equals space fraction numerator begin display style straight P subscript 1 straight V subscript 1 cross times straight T subscript 2 end style over denominator begin display style straight T subscript 1 cross times straight P subscript 2 end style end fraction

space space space space space space equals fraction numerator 764 cross times 50 cross times cross times 273 over denominator 290 cross times 760 end fraction

straight V subscript 2 space equals 47.31 space cc
 
The volume of gas is 47.31 cc.
Answered by Varsha | 28 Dec, 2018, 05:02: PM

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