Question

In a chemical reaction, 300 g of a baking soda mixture containing sodium bicarbonate and vinegar on heating gave 174 g of carbon dioxide gas. How much solid residue would be left over?

• A. 104 g
• B. 118 g
• C. 126 g
• D. 142 g

Answer 1

The correct option is C 126 g

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