Question

How many grams of H3PO4 are produced when 10.0 moles of water react with an excess of P4O10?

Answer 1

6.667 moles

Molar mass H3PO4 is 98 g/mol

mass of H3PO4 = 98 x 6.667 = 653.4g

mass of Cu = 27 , moles of Cu = 27 / 63.5 = 0.425

moles of Cr produce this Cu = .425 x 2/3 = 0.283 moles

or 0.283 x 52 = 14.7g