Question

10g mixture of NaHCO3 and Na2CO3 has 1.68gNaHCO3.It is heated at 400K. Weight of the residue will be_____

Answer 1

Answer:

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Answer 2

Answer:

9.38g

Explanation:

2NaHCO3----Heat ----Na2 CO3 +H2O+CO2 ↑

The molar mass of NaHCO3  is 84 g/mol.

The molar masses of CO2  and water are 44 g/mol and 18 g/mol respectively.

Thus, 2×84=168 g of NaHCO3  on decomposition will loose 44+18=62 g.  

Hence, 1.68 g of NaHCO3  on decomposition will lose 0.62 g.

Hence, the weight of the residue will be 10−0.62=9.38g

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