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Question
Concentrated nitric acid oxidizes phosphorous to phosphoric acid according to the following equation :
P + 5HNO3 → H3PO4 + H2O + 5NO2
What mass of phosphoric acid can be prepared from 6 .2 g of phosphorous?
Solution
Given equation is :
P + 5HNO3 → H3PO4 + H2O + 5NO2
Molecular mass of phosphorous = 31
Molecular mass of phosphoric acid = 98
31g of phosphorous produces = 98g of phosphoric acid
6.2g of phosphorous will produce = 98 x 6.2/31 = 19.6g
Hence, 19.6g of phosphoric acid can be prepared from 6.2g of phosphorous.
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