a. When `4.2 g NaHCO_(3)` is added to a solution of `CH_(3)COOH` is released into atomosphere. The residue is the found to weigh `12.0g`. Show that these observations are in agreement with the low of conservation of weigh.
b. If `6.3 g` of `NaHCO_(3)` are added to `15.0 g CH_(3)COOH` solution. The residue is found to weigh `18.0 g` what is the mass of `CO_(2)` released in this reaction?

Explanation

(a) `NaHCO_(3)+CH_(3)COOHrarr CH_(3)COONa+H_(2)O+CO_(2)`
Initial mass `= 4.2+10 = 14.2`
Final mass `= 12+2.2= 14.2`
Thus, during the course of reaction law of conservation of mass is obeyed.
(b) `NaHCO_(3)+CH_(3)COOHrarrCH_(3)COONa+H_(2)O+CO_(2)`
Initial mass `= 6.3+15= 21.3`
Final mass `= 18.0+` mass of `CO_(2)`
According to law of conservation of mass:
`21.3 = 18.0+` mass of `CO_(2)`
`:.` Mass of `CO_(2)= 3.3 g`