1.

Pressure over 1000 mlof a liquid is gradually increases from1 barto 1001 bar underadiabiticconditions. Ifthe finalvolumeof the liquid is 990 ml, calculateDeltaU and DeltaH of the process, assuminglinear variationof volume with pressure .

Answer»


Solution :W = Area uinder P-V curve
`=(1)/(2) xx(1000 xx 10 xx 10^(-3))+ 10 xx 10^(-3)`
`= 5.01 "bar"-L"" = 501 J`
`= 501 J`
`Q=0`
`Delta U = 501 J""(DELTAU= q +W)`
DeltaH = DeltaU + Delta(PV) = DeltaU + (P_(2)V_(2)- P_(1)V_(1))
` = 501+[1001 xx 990 xx 10^(-3) - 1 xx 10^(-3)xx 10^(-3)] xx 100= 501 + 98999 J`
`DeltaH = 99.5 KJ`


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