Question

1 mol of $KCl{O}_3$ is heated in the presence of $Mn{O}_2$. The produced oxygen is used to react with aluminium. Find the number of moles of aluminium oxide formed.

• A. 2 mol
• B. 1 mol
• C. 4 mol
• D. 3 mol

Answer 1

The correct option is B 1 mol

The balanced reactions involve are:
$KCl{O}_3\stackrel{\Delta }{\to }KCl+\frac{3}{2}{O}_2$
$2Al+\frac{3}{2}{O}_2\to A{l}_2{O}_3$

1 mol of $KCl{O}_3$ produces 1.5 mol of $O_2$ gas.
In the seccond reaction, 1.5 mol of $O_2$ will produce 1 mol of $A{l}_2{O}_3$.