Question

A test tube along with calcium carbonate in it initially weighed $30.08g$. A heating experiment was performed on this test tube till calcium carbonate completely decomposed with evolution of a gas. Loss of weight during this experiment was $4.40gm$. What is the weight of the empty test tube in this experiment?

• A. $20.08g$
• B. $21.00g$
• C. $24.50g$
• D. $2.008g$

Answer 1

The correct option is A $20.08g$

Let the weight of empty test tube be $xgm$.
$CaC{O}_3\to CaO+C{O}_2$
When $C{O}_2$ produced is $44gm,CaC{O}_3$ needed is $100gm$.
$\therefore$ When $C{O}_2$ produced is $4.4g,CaC{O}_3$ needed is $\frac{100}{44}\times 4.4=10gm$
If mass of $CaC{O}_3$ is $10gm$, then weight of empty test tube
$=30.08-10.00=20.08g$.