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  4. The heat of combustion of yellow phosphorus and red phosphorus are -9.91 kJ/mol and -8.78 kJ/mol respectively. The heat o f transition from yellow phosphorus to red phosphorus is

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Q. The heat of combustion of yellow phosphorus and red phosphorus are $-9.91 kJ/mol$ and $-8.78 kJ/mol$ respectively. The heat o f transition from yellow phosphorus to red phosphorus is

Thermodynamics

Solution:

$P_{\text{yellow}}\to P_{\text{red}}$
$H_{R}=-9.91-\left[-8.78\right]$
$= -9.91 + 8 .78 = -1 .13 kJ$