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Phosphoryl chloride, Cl3PO, is made by the reaction shown below:

P4O10 + 6PCl5 --> 10Cl3PO

How much energy could be obtained when 50g of tetraphorphous deacaoxide, P4O10, is reacted? You are given the following thermochemical equations:

1) P4 + 6Cl2 --> 4 PCl3 | H = -1272 KJ

2) P4 + 5O2 --> P4O10 | H = -2915 KJ

3) PCl3 + Cl2 --> PCl5 | H = -125 KJ

4) PCl3 + 1/2O2 --> Cl3PO | H = -267 KJ

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