When 10.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction?
Ca(s) + 2 H₂O(l) → Ca(OH) ₂(aq) + H₂(g)

Question

Quizplus · Accepted Answer

The theoretical yield of calcium hydroxide is calculated using stoichiometry. The molar mass of calcium is 40.08 g/mol, so 10.0 g of calcium is 0.249 mol. According to the balanced equation, 1 mol of calcium produces 1 mol of calcium hydroxide. The molar mass of calcium hydroxide is 74.09 g/mol, so the theoretical yield is 0.249 mol × 74.09 g/mol = 18.45 g. The percent yield is (5.00 g / 18.45 g) × 100% = 27.1%.

When 100 G of Calcium Metal Is Reacted with Water,5