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JEE Advanced2006ChemistryThermodynamics (C)Actual

For the reaction, 2 CO + O ₂ 2 CO ₂ ; H=-560 ~kJ . Two moles of CO and one mole of O ₂ are taken in a container of volume 1 ~L . They completely form two moles of CO ₂ , the gases deviate appreciably from ideal behaviour. If the pressure in the vessel changes from 70 to 40 ~atm , find the magnitude (absolute value) of U at 500 ~K .(1 ~L - atm =0.1 ~kJ )

Correct answer

-557

Step-by-step solution

array ll & H= U+ (P V) or & H= U+V P or & U= H-V P array Given that, H=-560 ~kJ P=40-70=-30 ~atm array rlrl & & V P & =1 ~L -30 ~atm =-30 ~L atom & & 1 ~L -atom & =0.1 ~kJ & V P & =-30 0.1 ~kJ & U & =-560-(-30 0.1)=-557 ~kJ array

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