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A sample of CaCO 3 and MgCO 3 weighed 2.21 g is ignited to constant weight of 1.152 g. The composition of mixture is: (Given molar mass in g mol –1 CaCO 3 : 100, MgCO 3 : 84)

1. 1.187 g CaCO 3 + 1.023 g MgCO 3
2. 1.187 g CaCO 3 + 1.187 g MgCO 3
3. 1.023 g CaCO 3 + 1.187 g MgCO 3
4. 1.023 g CaCO 3 + 1.023 g MgCO 3

Correct answer: 1.187 g CaCO 3 + 1.023 g MgCO 3

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