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Question

In which case, purity of the substance is 100%?

A
1 mole of CaCO3 gave 11.2L CO2 (at STP).
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B
1 mole of MgCO3 gave 40.0g MgO.
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C
1 mole of NaHCO3 gave 4g H2O.
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D
1 mole of Ca(HCO3)2 gave 1 mole CO2.
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Solution

The correct option is C 1 mole of MgCO3 gave 40.0g MgO.
Assuming all are 100% pure, then,
1 mole of CaCO3 should give 22.4 L CO2 (at STP).
1 mole of MgCO3 should give 40.0 g MgO.
1 mole of NaHCO3 should give 9 g H2O.
1 mole of Ca(HCO3)2 should give 2 mol CO2.

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