What mass of calcium chloride forms when 4.0 g of calcium burns completely in chlorine (Ca = 40, Cl = 35.5)?
Correct answer C. 11.1 g
Explanation
4.0 g Ca is 0.1 mol, and Ca + Cl₂ → CaCl₂ gives 0.1 mol CaCl₂. Its molar mass is 111 g mol⁻¹, so the mass is 11.1 g.
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