Law of conservation of mass: When `4.2 g` of sodioum hydrogen carbone `(NaHCO_(3))` is added to a solution of acertc aacid `(CH_(3) COOH)` weighting `10.0 g` then `2.2 g` of carbon diosxed `(CO_(2))` is released into the atmosphere and the residue ledft weighs `12.0 g`. Show that these observation are in agreement with the law of conservation of mass.
Strategy: Find the sum total of mass of recants before the reaction and sum total of mass of products after the reaction.

Explanation

Sum total fo mass of rectans :
`m_(NaHCO_(3)) + m_(CH_(3) COOH) = 4.2g + 10.0g`
`= 14.2 g`
Sum total of mass of products :
`m_("residue") + m_(CO_(2)) = 12.6g + 2.2 g`
`= 14.2 g`
Thus, the law of conservation of mass is valid.