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ICSE Class 9 Answered

calculate the volume of dry air at stp that occupies28cm3 at 14c and 750mm hg pressure when saturated with water vapour the vapour pressure of the water at 14c is 12mm hg  
Asked by Soham | 17 Feb, 2018, 05:10: PM
answered-by-expert Expert Answer
Given colon

straight P subscript 1 equals space 750 space mmHg

space space space equals space 750 space plus space 12

Vapour space pressure space of space gas space equals space 14 space mm space Hg

therefore space straight P subscript 1 equals space 762 space mmHg

straight V subscript 1 space equals space 28 space cm cubed

straight T subscript 1 space equals space 14 space to the power of straight capital omicron straight C space

space space space space space space space equals space 273 plus 14

straight T subscript 1 space space space space equals space 287 space straight K

At space STP

straight P subscript 2 space equals space 1 space atm space
space space space space space space space equals 760 space mmHg

straight T subscript 2 space equals space 273 space straight K

straight V subscript 2 space equals space ?

We space have comma

space fraction numerator straight P subscript 1 straight V subscript 1 over denominator straight T subscript 1 end fraction space equals fraction numerator straight P subscript 2 straight V subscript 2 over denominator straight T subscript 2 end fraction

fraction numerator 762 cross times 28 over denominator 287 end fraction equals space fraction numerator 760 cross times straight V subscript 2 over denominator 273 end fraction


74.34 space equals space 2.783 cross times straight V subscript 2

straight V subscript 2 space equals space 26.71 space cc

Volume space of space dry space gas space at space STP space equals space 26.71 space cc
Answered by Varsha | 17 Feb, 2018, 07:27: PM

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