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Question

Phosphoric acid (H3PO4) is widely used to make fertilizers and can be prepared in a two-step process.
StepI:P4+5O2P4O10
StepII:P4O10+6H2O4H3PO4
We allow 310 g of phosphorus to react with excess oxygen, which forms tetraphosphorus deoxide (P4O10) in 50% yield. In the step II, 25% yield of H3PO4 is obtained.
(Atomic weight in amu of P=31,H=1,O=16)
Assuming 100% yield, the number of moles of H3PO4 is :

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Solution

310gmP4=310124molP4=2.5molP4=2.5×4=10molH3PO4

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