Question # During the decomposition of ( 14.2 mathrm{gm} ) of a mixture of calcium carbonate and magnesium

# During the decomposition of ( 14.2 mathrm{gm} ) of a mixture of calcium carbonate and magnesium

carbonate 3.36 litres of ( mathrm{CO}_{2} ) at S.T.P. are evolved. Determine the mass percents of

carbonates in the mixture.

Solution

( frac{x}{100}+frac{(14.2-x)}{84}=left(frac{3.36}{22.4}right) )

2) ( frac{84 x+1420-100 x}{8400}=left(frac{3.36}{22.4}right) )

2) ( frac{1420-16 x}{8400}=left(frac{3.36}{22.4}right) )

2) ( 31808-358.4 x=28224 )

2) ( 358.4 x geq 3584 )

( Rightarrow x=10 g )

( " cdot operatorname{Caco}_{3}=frac{10}{14.2} times 100=70.401 )

( % mathrm{Mg}left(0, frac{4.2}{14.2} times 100=29.5 right. )