The right option for the mass of CO2 produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40) [CaCO3 ⎯⎯⎯⎯→ 1200 K CaO + CO2] (A) 1.76 g (B) 2.64 g (C) 1.32 g (D) 1.12 g

Question

The right option for the mass of CO2 produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40) [CaCO3 ⎯⎯⎯⎯→ 1200 K CaO + CO2]

(A) 1.76 g
(B) 2.64 g
(C) 1.32 g
(D) 1.12 g

Prashant Kotian · Accepted Answer

Correct answer: A. Weight of impure limestone = 20 g Weight of pure limestone (CaCO3) = 20% of 20 g = 20 20 100 = 4g 7 = 3 CaCO 4 n 100 = 0.04 CaCO3 → CaO + CO2 n=0.04 n=0.04 2 CO n = 0.04 2 CO W = 0.04 × 44 = 1.76 g

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