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For the reaction, 2CO + O(2) to 2CO(2), ...

For the reaction, `2CO + O_(2) to 2CO_(2), DeltaH = -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 `DeltaU` at 500 K.

Text Solution

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`H =U +PV`
`DeltaH+ DeltaU + Delta(PV) ` or ` DeltaH = DeltaU + VDeltaP`
or `DeltaU = DeltaH -VDeltaP = - 560kJ - 1L ( 40 atm -70 atm)`
`=- 560 kJ + 30 Latm = - 560 kJ + 3-0 xx 0.1kJ = - 557 kJ `
Absolute value `=557 kJ . `
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