The enthalpy change for the reaction of 5 litre of ethylene with 5 litre of \( \mathrm{H}_{2} \)...

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The enthalpy change for the reaction of 5 litre of ethylene with 5 litre of \( \mathrm{H}_{2} \) gas at 1.5 atm pressure is \( \Delta \mathrm{H}=-0.5 \mathrm{~kJ} \). The value of \( \Delta \mathrm{U} \) will be : \( (1 \mathrm{~atm} \mathrm{~L}=100 \mathrm{~J}) \)
(a) \( -1.25 \mathrm{~kJ} \)
(b) \( +1.25 \mathrm{~kJ} \)
(c) \( 0.25 \mathrm{~kJ} \)
\( -(d)-0.25 \mathrm{~kJ} \)
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