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