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Question

Concentrate nitric acid oxidises phosphorus to phosphoric acid according to the following equation:
P+5HNO3(conc.)H3PO4+H2O+5NO2
What mass of phosphoric acid can be prepared from 6.2 g of phosphorous?

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Solution

P+5HNO3H3PO4+H2O+5NO2
No. of moles of P = 9.331 = 0.3 moles.

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