Question

One mole of potassium chlorate is thermally decomposed and excess of aluminium is burnt in the gaseous product. How many mole(s) of aluminium oxide are formed?

• A. 1
• B. 1.5
• C. 2
• D. 3

Answer 1

The correct option is A 1

$KCl{O}_3\to KCl+\frac{3}{2}{O}_2$
$2Al+\frac{3}{2}{O}_2\to A{l}_2{O}_3$
1 mol of $KCl{O}_3\equiv$ 1 mol of $A{l}_2{O}_3$