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3. ATOMS AND MOLECULES
medium
In a reaction, $5.3\, g$ of sodium carbonate reacted with $6\, g$ of acetic acid. The products were $2.2\, g$ of carbon dioxide, $0.9 \,g$ water and $8.2\, g$ of sodium acetate. Show that these observations are in agreement with the law of conservation of mass.
sodium carbonate $+$ acetic acid $\to $ sodium acetate $+$ carbon dioxide $+$ water
Option A
Option B
Option C
Option D
Solution
Law of conservation of mass states that mass is neither created nor destroyed during a chemical reaction.
It means the mass remains the same. So, we add the mass of the reactants on $ LHS$ and add the mass of all products on $RHS$
$LHS =5.3 \,g +6 \,g =11.3\, g$
$RHS =8.2\, g +2.2\, g +0.9 \,g =11.3 \,g$
$LHS = RHS$
So, the observations are in agreement with the law of conservation of mass.
Standard 9
Science
