Question

the heats of combustion of yellow P and red P are - 9.91 KJ and - 8.78KJ respectively. the heat of transition of yellow to red phosphorus is?

Answer 1

The heat of transition is +1.13KJ
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Answer 2

Answer:The heat of transition of yellow to red phosphorus is -1.13 kJ.

Explanation;

Combustion of Yellow phosphorus.

$P_4(s)+5O_2(g)\rightarrow P_4O_{10}(s),\Delta H_y=-9.91 kJ$..(1)

Combustion of Red phosphorus.

$P_4(g)+5O_2(g)\overset{565 K}\rightarrow P_4O_{10}(s),\Delta H_r=-8.78 kJ$...(2)

(1)-(2)

$P_4(s)(yellow)\rightarrow P_4(red)\Delta H=?$

$\Delta H=\Delta H_y-\Delta H_r=-9.91 kJ-(-8.78 kJ)=-1.13 kJ$

The heat of transition of yellow to red phosphorus is -1.13 kJ.