Question

In a chemical reaction, $300\text{g}$ baking soda mixture containing sodium bicarbonate and vinegar on heating gives $174\text{g}$ carbon dioxide gas. How much solid residue would be left over?

• A. $104\text{g}$
• B. $118\text{g}$
• C. $126\text{g}$
• D. $128\text{g}$

Answer 1

The correct option is C $126\text{g}$

We know,
According to law of conservation of mass,
$\text{Total mass of reactants = total mass of products}$
Here,
Mass on the reactant side $=300\text{g}$
Given,
Mass of $C{O}_2$ liberated $=174\text{g}$
So, from the law of conservation of mass,
$300\text{g}$ = mass of residue + mass of $C{O}_2$
$\Rightarrow \text{mass of residue}=(300-174)\text{g}=126\text{g}$