Determine the mass of calcium oxide formed by burning 20 g of calcium in air.

univerkov | December 8, 2020 | education

2Ca + O2 = 2CaO
M (Ca) = 40 g / mol
∨ (Ca) = m / M = 20/40 = 0.5 mol
∨ (СaO) = 0.5 mol
M (CaO) = 56 g / mol
m (CaO) = 56 * 0.5 = 28 grams
Answer 28 grams

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