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If DeltaH is the enthalpy change and Del...

If `DeltaH` is the enthalpy change and `DeltaU` the change in internal energy accompanying a gaseous reaction, then

A

`DeltaH` is always less than `DeltaU`.

B

`DeltaH` is always than `DeltaU`.

C

`DeltaH` is less than `DeltaU` if the number of moles of gaseous products is greater than the number of moles of gaseous reactants.

D

`DeltaH` is less than `DeltaU` if the number of moles of gaseous products is less than the number of moles of gaseous reatants.

Text Solution

Verified by Experts

As `DeltaH = DeltaU +Deltan_(g)RT`
`DeltaH` value is less than or greater than `DeltaU` depending on the value of `Deltan_(g)` which is the change in number of moles of the gaseous components.
As result, (a) and (b) cannot be true.
`DeltaH lt DeltaU` when `Deltan_(g) lt 0`, hence (c ) is also false only (d) is correct.
Hence, (d) is the correct answer.
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Knowledge Check

  • If DeltaH is the enthalpy change and DeltaE the change in internal energy accompanying a gaseous reaction then

    A
    `DeltaH` is always less than `DeltaE`
    B
    `DeltaH` is always greater than `DeltaE`
    C
    `DeltaH` is less than `DeltaE` if the number of gaseous products is greater than the number of moles of gaseous reactants.
    D
    `DeltaH` is less than `DeltaE` if the number of moles of gaseous products is less than the number of moles of gaseous reactants.

  • If DeltaH is the enthalpy change and DeltaE the change in internal energy accompanying a gaseous reaction then

    A
    `DeltaH` is always less than `DeltaE`
    B
    `DeltaH` is always greater than `DeltaE`
    C
    `DeltaH` is less than `DeltaE` if the number of gaseous products is greater than the number of moles of gaseous reactants.
    D
    `DeltaH` is less than `DeltaE` if the number of moles of gaseous products is less than the number of moles of gaseous reactants.

  • If DeltaH is the change in enthalpy and DeltaE , the change in internal energy accompanying a gaseous reaction, then:

    A
    `DeltaH` is always greater than `DeltaE`
    B
    `DeltaH lt DeltaE` only if the number of moles of the products is greater than the number of moles of the reactants.
    C
    `DeltaH` is always less than `DeltaE`
    D
    `DeltaH lt DeltaE` only if the number of moles of products is less than the number of moles of the reactants.

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