Enthalpy change equal internal energy change when

all the reactants and products are in solution

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reaction is carried out in a closed vessel

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number of moles of gaseous reactants and that of products is equal

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reaction is carried out at constant pressure

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Solution

The correct options are
A all the reactants and products are in solution
B reaction is carried out in a closed vessel
C number of moles of gaseous reactants and that of products is equal
As we know,
$Δ H = Δ U + Δ n R T$
when
$Δ n = 0 = n_{P} - n_{R}$
$Δ H = Δ U$
Also, when volume change is negligible, $Δ H = Δ U$

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Enthalpy change equal internal energy change when

The correct options are A all the reactants and products are in solution B reaction is carried out in a closed vessel C number of moles of gaseous reactants and that of products is equalAs we know,ΔH=ΔU+ΔnRTwhenΔn=0=nP−nRΔH=ΔUAlso, when volume change is negligible, ΔH=ΔU