Question Detail
Question
What mass of CaO is produced from the decomposition of 50.0 g of CaCO₃? CaCO₃ → CaO + CO₂ (Ca=40, C=12, O=16)
Correct Answer
Option A is the correct answer.
Detailed Explanation
Molar mass CaCO₃ = 100 g/mol. Moles CaCO₃ = 50.0/100 = 0.500 mol. 1:1 mole ratio, so moles CaO = 0.500 mol. Molar mass CaO = 56 g/mol. Mass CaO = 0.500 × 56 = 28.0 g.
Hint
Use the mole ratio from the balanced equation to convert from moles of reactant to moles of product.