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A certain mass of an ideal gas is expanded from (1L, 10 bar) to (4L,5bar) against a constant external pressure of 1 bar. If initial temperature of gas is 300 K and the heat capacity of process is 50J//""^(@)C. Then the enthalpy change during the process is : |
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Answer» `DeltaH=14.7 KJ` `(P_(1)V_(1))/(T_(1))=(P_(2)V_(2))/(T_(2))implies(10xx1)/(300)=(5xx4)/(T_(2))` `implies T_(2)=600K` `Q=CDeltaT=50xx[600-300]=15000` Joule=15kJ `W=-P_("EXT")[V_(2)-V_(1)]` `=-1[4L-1L]=-`3BAR litre=-0.3 kJ `Delta=Q+W` `=15-0.3=14.7kJ` `Delta=DeltaU+(P_(2)V_(2)-P_(1)V_(1))` `=[14.7+(5xx4-10xx1)/(10)]kJ=15.7` |
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