Assume each reaction is carried out in an open container.
For which reaction will `DeltaH=DeltaU` ?

Options

A. `PCl_(3)(g)rarrPCl_(3)(g)+Cl_(2)(g)`
B. `2CO(g)+O_(2)(g)rarr2CO_(2)(g)`
C. `H_(2)(g)+Br_(2)(g)rarrHBr(g)`
D. `C(s)+2H_(2)O(g)rarr2H_(2)(g)+CO_(2)(g)`

Answer

C

Explanation

`Deltan=0` and thus from `DeltaH=DeltaU+DeltanRT`
`DeltaH=DeltaU`