Question

In a chemical reaction, $100g$ baking soda mixture containing sodium bicarbonate and vinegar on heating gives $43g$ of carbon dioxide gas. What mass of solid residue is left in food?

• A. $54g$
• B. $55g$
• C. $56g$
• D. $57g$

Answer 1

The correct option is D $57g$

According to law of conservation of mass, total mass of reactants is equal to total mass of products. Here baking soda mixture on heating gives solid residue and carbon dioxide.
$M_{\text{Baking soda mixture}}=M_{\text{solid residue}}+M_{C{O}_2}$

or it can be written as:

$M_{\text{solid residue}}=M_{\text{Baking soda mixture}}-M_{C{O}_2}$ $\left(Eq1\right)$

According to the question

$M_{\text{Baking soda mixture}}=100g$

$M_{C{O}_2}=43g$

Substituting the value in equation $1$, we get

The mass of solid residue is $100g-43g=57g$