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ICSE Class 9 Answered

Calculate the volume of dry air at S.T.P. that occupies 28cm3 at 14 degree Celsius and 750 mm Hg pressure when saturated with water vapour.The vapour pressure of water at 14 degree Celsius is 12 mm Hg.
Asked by pradeepkumarsamal | 30 Aug, 2018, 09:43: PM
answered-by-expert Expert Answer
Given: 
P2= 760mm Hg
P1 = 750-12= 738 mm Hg 
T1= 14°C = 14 + 273 = 287 K
T2= 0°C = 273K
V1=28 cm3
V2= ?
 
Formula used: fraction numerator straight P subscript 1 straight V subscript 1 over denominator straight T subscript 1 end fraction space equals space fraction numerator straight P subscript 2 straight V subscript 2 over denominator straight T subscript 2 end fraction
 
Solution: 
 
Lets put these values in the above formula,
 
fraction numerator 738 cross times 28 over denominator 287 end fraction space equals space fraction numerator 760 cross times straight V subscript 2 over denominator 273 end fraction therefore space straight V subscript 2 equals space fraction numerator 738 cross times 28 cross times 273 over denominator 287 cross times 760 end fraction space equals space 5641272 over 218120 space equals space 25.86 space ml
Answered by Ramandeep | 31 Aug, 2018, 10:40: AM

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