A sample of P₄O₁₀ weighing 7.1 g is dissolved in water. How many grams of Phosphoric Acid are formed?
- 9.8 g
- 4.9 g
- 19.6 g
- 7.1 g
📝 Detailed explanation
P₄O₁₀ + 6H₂O → 4H₃PO₄.n(P₄O₁₀) = 7.1 / 284 = 0.025 mol.
n(H₃PO₄) = 0.025 * 4 = 0.1 mol.
M(H₃PO₄) = 3 + 31 + 64 = 98 g/mol.
Mass = 0.1 * 98 = 9.8 g.