Question

How many grams of oxygen is required to completely react with $0.2\text{g}$ of hydrogen to yield water?

• A. $1.8\text{g}$
• B. $12\text{g}$
• C. $16\text{g}$
• D. $1.6\text{g}$

Answer 1

The correct option is D $1.6\text{g}$

$2H_2+O_2\to 2H_{2}O$

2 mol of hydrogen react with 1 mol of oxygen to form 2 mol of water, i.e.
$4\text{g}$ of hydrogen require $32\text{g}$ of oxygen to form water
So, $0.2\text{g}$ of $H_2$ requires = $\frac{32}{4}\times 0.2=1.6\text{g}$ of $O_2$