1.

Concentrated nitric acid oxidises phosphorus to phosphoric acid according to the equation :P + 5HNO3(conc.) ---> H3PO4 + H2O + 5NO2If 9.3 g of phosphorus was used in the reaction, calculate : The mass of phosphoric acid formed.

Answer»

Molecular weight of H3PO4 = (1 x 3) + (31) + (4 x 16)

= 3 + 31 + 64 = 98

31 g of phosphorus gives 98 g of phosphoric acid

9.3 g of phosphorus gives = (98 x 9.3)/31 = 29.4 g of phosphoric acid.



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