A 15.5 gram sample of diphosphorous pentoxide contains how many grams of phosphorous?

Question

Quizplus · Accepted Answer

Diphosphorous pentoxide (P2O5) has a molar mass of 141.94 g/mol. Phosphorus (P) has a molar mass of 30.97 g/mol. In P2O5, there are 2 phosphorus atoms, so the mass of phosphorus in P2O5 is 61.94 g/mol. The mass fraction of phosphorus in P2O5 is 61.94/141.94. Therefore, in a 15.5 g sample of P2O5, the mass of phosphorus is (61.94/141.94) * 15.5 = 6.76 g.

A 155 Gram Sample of Diphosphorous Pentoxide Contains How Many Grams