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