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The heat of combustion of yellow phoshph...

The heat of combustion of yellow phoshphorus and red phosphorus are `-9.91KJmol^(-1)` and `-8.78` KJ/mol respectivaly. The heat of transition from yellow phosphrous to red phosphorus is

A

-18.69 KJ

B

+1.13 KJ

C

+ 18.68 KJ

D

-1.13 KJ

Text Solution

Verified by Experts

The correct Answer is:
D
Transition of yellow P to red P is
`P_("yellow") rarr R_("red")," "Delta H=?`
`Delta H("(yellow "rarr " red)")=(Delta H_(c))_("yellow") -(Delta H_(c))_("red")`
`=-9.91-(-8.81)`
`Delta H _((y rarr r))=-1.13 kJ`
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