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The molar heat ofreaction of NH(4)NO(3(s...

The molar heat ofreaction of `NH_(4)NO_(3(s)) rarr N_(2)O_((g)) + 2H_(2)O_((l))," is "-122.55 KJ" at "25^(@)C and 1.0` atmospheric pressure. `Delta U` for the reaction :

A

-250.037 KJ

B

-125.037 KJ

C

-77.014 KJ

D

127.037 KJ

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta H = Delta U + Delta nRT`
`Delta n=(1+0)-0=1`
`therefore Delta U = Delta H- Delta nRT`
`=-122.55-(1xx8.314xx10^(-3)xx298)`
`=-122.55-2.4775=-125.027`
`Delta U =-125.037 kJ`
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