1.

Consider the reaction, N_(2) + 3H_(2) rarr 2NH_(3) carried out ata constant temperature and pressure. If DeltaH and Delta U are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?

Answer»

`DELTA H = 0`
`Delta H = Delta U`
`Delta H LT Delta U`
`Delta H gt Delta U`

Solution :For `N_(2) + 3H_(2) rarr 2NH_(3)`
`Delta n_(g) = 2 - (1 + 3) = -2`
`Delta H = Delta U + Delta n_(g) RT = Delta U - 2RT`
:. `Delta H lt Delta U`


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