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Grade 12th passPhysical Chemistry

A rigid and insulated tank of 3 m^3 volume is divided into two compartments. One compartment of volume 2 m^3 contain an ideal gas at 0.8314 Mpa and 400 K and while the second comprtmnt of volume 1 m^3 contains the same gas at 8.314 Mpa and 500 K.If partition between the two compartments is ruptured what is the temperature of the gas.
The correct option is 480 K...
Kindly share the method to solve it

Profile image of Diksha ghosh
7 Years agoGrade 12th pass
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2 Answers

Profile image of Vikas TU
7 Years ago
No. of moles (n1) = P1V1/RT1 = (2*0.8314*10^6)/(0.8314*400*10^4) => ½
No. of moles (n2) = P2V2/RT2 = (1*0.8314*10^6)/(0.8314*10^4*500) = 2
 
Total moles = 2 + ½ = 5/2 = 2.5 moles. 
 
Since total moles are equal before and after reaction:
Peq. = (P1V1 + P2V2)/(P1 + P2) => ((0.831)*2 + (8.314)*1))*10^6/3 => 3.32 x 10^6 Pa.
 
Peq.*Vtotal  = ntotal*R*T
T = (3.32)*3*10^6/(2.5 * 8.314 * 10^6) => 480 K
Profile image of Raj Shakya
7 Years ago
no. of moles  n1 = P1V1/RT1 = (2*0.8314)/(R*400)  ------i
no. of moles n2 = P2V2/RT2 = (1*8.314)/(R*500)  ----- ii
 
as container is insulated heat realsed from 1 compartment will be equal to heat absorbed by another compartment to attain a common temperature.
suppose C as molar heat capacity since C = dq/(dT*n)
so n1*C*(T – 400) =  – n2 *C*(T – 500)
so putting n1 and n2
2*0.8314*(T-400)/(R*400) = 1*8.314*(500-T)/(R*500)
by solving 5T = 2400
T =480

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