Question

Phosphorus trichloride, PCl3, decomposes to form elemental phosphorus and chlorine. The equation is: 4PCl3 → P4 + 6Cl2. Balance the equation and determine the mass in grams of chlorine that would be formed if 25 grams of PCl3 (molecular mass = 137.32 g/mol) decompose. grams of Cl2

Answer 1

mCl₂ ≈ 71 g/mol
...............
4PCl₃ ----> P₄ + 6Cl₂
549,28g............426g

549,28g PCl₃ --- 426g Cl₂
25g PCl₃ ---------- X
X = (25×426)/549,28
X = 19,389 ≈ 19,4g Cl₂