Question

Two moles of a triatomic linear gas (neglect vibration degree of freedom) are taken through a reversible process ideal starting from A as shown in figure.
The volume ratio `(V_(B))/(V_(A))=4`. If the temperature at A is `-73^(@)C`, then :

Work done by the gas in AB process is :
`6.16` kJ
`308.3` kJ
`9.97` kJ
0 J
(ii) Total enthalpy change in both steps is :
A. 3000 R
B. 4200 R
C. 2100 R
D. 0

Answer 1

Correct Answer - B::C
(i) (c) `w=-P.DeltaV=-nRDeltaT=-2xx8.314xx600`
`=-9.97kJ`
(ii) (b) `DeltaH_("total")=DeltaH_(AB)+DeltaH_(BC)=nC_(p,m)DeltaT+0`
`=2xx(7)/(2)xxRxx(800-200)`
= 4200 R