Question

10 gm $H_2$ and 64 gm $O_2$ were taken in a sealed vessel and exploded. The amount of water produced in the reaction was:

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

Answer 1

Answer: (B)

4 mole

The balanced chemical equation for formation of water from hydrogen and oxygen can be written as:
$2H_2+O_2\to 2H_{2}O$
64g of $O_2$ = $\frac{64}{32}$ = 2moles of $O_2$
Now 1mole of oxygen forms = 2moles of water
Therefore 2moles of oxygen will form = 4 moles of water.