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AP EAMCET2011ChemistrySome Basic Concepts of Chemistry

19 ~g of a mixture containing NaHCO ₃ and Na ₂ CO ₃ on complete heating liberated 1.12 ~L of CO ₂ at STP. The weight of the remaining solid was 15.9 ~g . What is the weight (in g) of Na ₂ CO ₃ in the mixture before heating?

Options

  1. A8.4
  2. B15.9
  3. C4.0
  4. D10.6

Correct answer

D. 10.6

Step-by-step solution

Molecular weight of NaHCO ₃=23+1+12+48=84 Molecular weight of Na ₂ CO ₃=46+12+48=106 Hence, total weight =84+106=190 In 190 ~g of a mixture, weight of Na ₂ CO ₃ is =106 In 19 ~g of a mixture weight of aligned Na ₂ CO ₃ & = 106 19 190 & =10.6 ~g aligned

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