InterviewSolution
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InterviewSolution
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If `DeltaH` is the enthalpy change and `DeltaU` the change in internal energy accompanying a gaseous reaction, thenA. `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. |
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Answer» 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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