Question

$10.0g$ of $CaC{O}_3$ on heating gave $4.4g$ of $C{O}_2$ and $5.6g$ of $CaO$. This observation is in agreement with the:

• A. law of constant composition
• B. law of multiple proportion
• C. law of reciprocal proportion
• D. law of conservation of mass

Answer 1

The correct option is D law of conservation of mass

$CaC{O}_3\to CaO+C{O}_2$
10 gm 5.6 gm 4.4 gm

Mass of $CaC{O}_3\left(10gm\right)=$ Mass of $CaO\left(5.6gm\right)$ + Mass of $C{O}_2\left(4.4gm\right)$

Hence, it proves the law of conservation of mass.