ThermochemistryMedium
Question
The heat of combustion of yellow phosphorous is - 9.91 kJ and of red phosphorous to redphosphorus is :
Options
A.- 9.91 kJ
B.- 8.78 kJ
C.- 9.34 kJ
D.- 1.13 kJ
Solution
P(red) + 
O2 → P2O5 ; H = - 8.78
P(yellow) +O2 → P2O5 ; = - 9.91
Subtracting
P(red) +O2 - P(Yellow) = 0;
ᐃH = - 8.78 + 9.91 = 3.113
P(Red) → P(Yellow) ᐃH = 1.13
P(Yellow) → P(Red) ᐃH = - 1.13
O2 → P2O5 ; H = - 8.78P(yellow) +
O2 → P2O5 ; = - 9.91Subtracting
P(red) +
O2 - P(Yellow) = 0;ᐃH = - 8.78 + 9.91 = 3.113
P(Red) → P(Yellow) ᐃH = 1.13
P(Yellow) → P(Red) ᐃH = - 1.13
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