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State a chemical reaction in which Delta...

State a chemical reaction in which `DeltaH and DeltaU` are equal.

A

`H_(2)(g) + Br_(2)(g) to 2HBr(g)`

B

`C(s) + 2H_(2)O(g) to 2H_(2)(g) +CO_(2)(g)`

C

`PCl_(5)(g) to PCl_(3) + Cl_(2)(g)`

D

`2CO(g) + O_(2)(g) to 2CO_(2)(g)`

Text Solution

Verified by Experts

The correct Answer is:
A
As we know that, `DeltaH=DeltaE+pDeltaV " or " DeltaH= DeltaE+ Deltan_(g) RT`
where , `Deltan_(g) to ` number of gaseous moles of product -number of gaseous moles of reactant
If `Deltang=0` (for reactants in which the total number of moles of gaesous reactants ), therefore `DeltaH-DeltaE` So, for reaction (a) `Deltan=2-2=0`
Hence, for reaction (a) `DeltaH=DeltaE`
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