Ca3 (PO4) 2 + 3 SiO2 + 5 C → 3 CaSiO3 + 5 CO + 2 P

Given the balanced reaction above, what mass (in grams) of phosphorus is produced if 36 g C react?

Answer is: mass of phosphorus is 37,16 grams.

m (C) = 36 g.

n (C) = m (C) : M (C).

n (C) = 36 g : 12 g/mol.

n (C) = 3 mol.

From balanced chemical reaction: n (C) : n (P) = 5 : 2.

n (P) = 2 · 3 mol : 5.

n (P) = 1,2 mol.

m (P) = 1,2 mol · 30,97 g/mol.

m (P) = 37,16 g.