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Question

What weight of HNO3 is required to convert 62gmsP4 to H3PO4 in the given reaction?

P+HNO3H3PO4+NO2+H2O


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Solution

Step 1: Write the balanced reaction and determine the molar mass of P4 and HNO3.

P+20HNO3H3PO4+20NO2+H2O

Molar mass of P4=124g/mol

Molar mass of HNO3=63g/mol

Step 2: Determine the mass of HNO3 reacted with 124g/molP4

1moleP4 reacts with 20moles of HNO3

124g/molP4 reacts with 20×63g of HNO3

Step 3: Calculate the mass of HNO3 reacted with 64g/molP4

64g/molP4 reacts with 20×63×62124=630g of HNO3

Hence, the weight of HNO3 required to convert 62gmsP4 to H3PO4 in the given reaction is 630g.


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