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The reaction of cyanamide NH(2)CN(s) wit...

The reaction of cyanamide `NH_(2)CN(s)` with oxygen was carries out in a bomb calorimeter and `Deltaq_(v)` at `300K` was measured to be `-750KJ//mol` . The value of `DeltaH` per mole of `NH_(2)CN(s)` in the given reaction is

A

`-741.75KJ//mol`

B

`-748.75KJ//mol`

C

`-752.75KJ//mol`

D

`-750KJ//mol`

Text Solution

Verified by Experts

The correct Answer is:
A
The combustion reaction is:
`NH_(2)CN(s)+(3)/(2)O_(2)(g)rarrN_(2)(g)+CO_(2)(g)+H_(2)O(l)`
`Deltan=(1)/(2)`
`DeltaH=DeltaE+DeltanRT=-750+(1)/(2)xx8.314xx10^(-3)xx300`
or `DeltaH=-750+0.15xx8.314=-748.75KJ//mol`
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