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Given two processes: (1)/(2)P(4)(s) ...

Given two processes:
`(1)/(2)P_(4)(s) +3CI_(2)(g) rarr 2PCI_(3)(l), DeltaH =- 635 kJ`
`PCI_(3) (l) +CI_(2)(g) rarrPCI_(5)(s), DeltaH =- 137 kJ` The value of `DeltaH^(Theta)` of `PCI_(5)` is

A

`454.5kJ" "mol^(-1)`

B

`-454.5kJ`

C

`-772kJ" "mol^(-1)`

D

`-498kJ" "mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(4)P_(4)(s)+(3)/(2)Cl_(2)(g)toPCl_(5)(l),DeltaH=-(635)/(2)kJ`
`PCl_(3)(l)+Cl_(g)toPCl_(5)(s),DeltaH=-137kJ`
On adding, `overline((1)/(4)P_(4)(s)+(5)/(2)Cl_(2)(g)toPCl_(5)(s),DeltaH=-137kJ)`
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