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Question

What is the relation between ∆H and ∆U?


A

∆H = ∆U - RT

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B

∆H = ∆U + RT

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C

∆H = ∆U + ∆nRT

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D

∆H = ∆U

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Solution

The correct option is C

∆H = ∆U + ∆nRT


The change in enthalpy during a process at constant pressure is given by the expression

∆H = ∆U + P∆V

Substituting the value of P∆V We get

∆H = ∆U + (∆n) RT

Here ∆n is the change in the number of moles of gaseous species.


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