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Phospheric acid (H(3)PO(4)) perpared i...

Phospheric acid `(H_(3)PO_(4))` perpared in two step process .
(1) `P_(4)+5O_(2) to P_(4)O_(10)" "(2) P_(4)O_(10) + 6H_(2)O to 4H_(3)PO_(4)`
Well allow 62 g of phosphrous to react with exces oxygen which from `P_(4)O_(10)` in `85%` yield . In the sep (2) reaction `90%` yield of `H_3)PO_(4)` is obtained . Mass of `H_(3) PO_(4)` produced is :

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