Question

When 4 g of a mixture of NaHCO₃ and NaCl is heated strongly, 0.66 g of CO₂ gas is evolved. Determine the% composition of the original mixture.

Answer 1

44 g CO₂ is evolved from 168 g NaHCO₃ 

0.66 g CO₂ is evolved from 168 x 0.66 / 44 = 2.52 g 

NaHCO₃

% NaHCO₃ = 2.52 x 100 / 4 = 63 % NaCl = 37