19g og a mixture containing `NaHCO_(3)` and `Na_(2)CO_(3)` on complete heating liberated `1,12L` of `CO_(2)` at STP. The weight of the remaining solid was `15.9g`. What is the weight (in g) of `Na_(2)CO_(3)` in the mixture before heating ?

Options

A. `8.4`
B. `15.9`
C. `4.0`
D. `10.6`

Answer

D

Explanation

Total weigth `=84 +106 = 190`
In 190g mix wt of `Na_(2)CO_(3) = 106`
in 19g mix wt of `Na_(2)CO_(3) = 10.6`