Question

What is the value of internal energy change `(DeltaU)` at `27^(@)C` a gaseous reaction `2A_(2)(g)+5B_(2)(g)to2A_(2)B_(5)(g)` (whose heat chhange at constant pressure is -50700J)? `(R=8.314JK^(-1)" "mol^(-1))`
A. `-50700J`
B. `-63171J`
C. `-38229J`
D. `+38299J`

Answer 1

Correct Answer - C
`DeltaH=DeltaU+Deltan_(g)RT`
`-50700=DeltaU+(-5)xx8.314xx300`
`DeltaU=-38229J`