The heats of combustion of yellow $P$ and red $P$ are $- 9.91 K J$ and $- 8.78 K J$ respectively. The heat of transition of yellow to red phosphorus is?

- 18.69 K J

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+ 1.13 K J

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+ 18.69 K J

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- 1.13 K J

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Solution

The correct option is C $- 1.13 K J$
$P_{y e l l o w} = - 9.91 K J$ $P_{r e d} = - 8.78 K J$
$P_{4} (y e l l o w) + 5 O_{2} ⟶ 2 P_{2} O_{5} = - 9.91 K J$
$P_{4} (r e d) + 5 O_{2} ⟶ 2 P_{2} O_{5} = - 8.78 K J$
heat of transition of yellow to red phosphorus is
$△ H_{(r e d)} - △ H_{(y e l l o w)} = - 8.78 - (- 9.91)$
$= - 1.13 K J$

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

The correct option is C −1.13KJPyellow=−9.91KJ Pred=−8.78KJP4(yellow)+5O2⟶2P2O5=−9.91KJP4(red)+5O2⟶2P2O5=−8.78KJheat of transition of yellow to red phosphorus is△H(red)−△H(yellow)=−8.78−(−9.91)=−1.13KJ

The heats of combustion of yellow $P$ and red $P$ are $- 9.91 K J$ and $- 8.78 K J$ respectively. The heat of transition of yellow to red phosphorus is?