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Difference between Internal Energy and Enthalpy

2CO+ O 2 → 2 ...

Question

$2 C O + O_{2} \to 2 {C O}_{2}; △ H = 560 k J$
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 ${C O}_{2}$ , the gases deviated appreciably from ideal behavior. If the pressure in the vessel change from 70 to 40 atm, find the magnitude (absolute value) of $△ U$ at 500 K. (1 L atm = 0.1 kJ)

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Solution

$q = Δ H = 560 K J$
$w = Δ P V$
$= (70 - 40) \times 1$
$= 30 L a t m = 30 \times 01 - K J$
$= 3 K J$
$Δ U = q + w$
$= (560 + 3) K J$
$= 563 K J$

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2 C O + O_{2} \to 2 C O_{2}; Δ H = - 560 K J

Two moles of CO and one mole of

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C O_{2}

the gases deviate appreciably from ideal behaviour. If the pressure in the vessel changes from 70 to 40 atm, then the magnitude (absolute value) of

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2 C O + O_{2} \to 2 C O_{2}, Δ H = - 560 K J

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1 a t m - l i t r e = 0.1 K J

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