Question

Phosphorus pentachloride is produced by the reaction between phosphine and chlorine gas. What mass of chlorine gas would be required to produced 0.015kg of phosphorus pentachloride?

Answer 1

2P + 5Cl₂ → 2PCl₅

M(PCl₅) = 31 + 35.5*5 = 208.5 g/mol

n(PCl₅) = m/M = 15g/208.5g/mol = 0.072 mol

n(Cl₂) = 0.072*2.5 = 0.18 mol

m(Cl₂) = n*M = 0.18mol*71g/mol = 12.78 g