Q.

For the given expression, ΔH=ΔU+ΔngRT, which of the following option is correct?

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a

Δng = number of moles of gaseous reactant - number of moles of gaseous Product

b

pΔV≠ΔngRT

c

pΔV=ΔngRT

d

All of the above

answer is C.

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Detailed Solution

According to the ideal gas law,pVA=nARTpVB=nBRTpVB-pVA=nBRT-nART=nB-nARTpVB-VA=nB-nARTpΔV=ΔngRTwhere, Δng refers to the number of moles of gaseous products minus the number of moles of gaseous reactants. Put the value of pΔV in equation, ΔH=ΔU+pΔV                                                       ΔH=ΔU+ΔngRT
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