Q.

1 g of a mixture of Na2CO3 and NaHCO3 is heated at 270C. The volume of CO2 produced at STP is 112 mL. The % of NaHCO3 in the mixture is _________

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answer is 84.

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Detailed Solution

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NaHCO3 decomposes at 270C but the decomposition temperature of Na2CO3 is very

2NaHCO32×84 g270CNa2CO3+CO222.4 L+H2O

 22.4 L of CO2 produced by =2×84 g  NaHCO3

0.112 L of CO2 produced by =2×8422.4×0.112

1 g of mixture contains =0.84 gNaHCO3

% of NaHCO3=84%

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