Question

For the reaction $2P+Q\to R$, 12 mol of $P$ and 8 mol of $Q$ are taken, then:

• A. 3 mol of $R$ is produced
• B. 6 mol of $R$ is produced
• C. 25 % of $Q$ is left behind
• D. both $\left(B\right)$ and $\left(C\right)$ are correct

Answer 1

Answer: (D)

both $\left(B\right)$ and $\left(C\right)$ are correct

According to the equation, 2 moles of $P$ react with 1 mole of $Q$ to give 1 mole of $R$, so 12 moles of $P$ react with 6 moles of $Q$ to give 6 moles of $R$.

Moles of $Q$ left$=8-6=2$

% of $Q$ left$=\frac{2}{8}\times 100=25\%$