Question

Given equation:

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

What does this reaction indicate?

• A. 2 molecules of hydrogen reacts with 1 molecule of oxygen to give 2 molecules of water
• B. 4 amu of hydrogen reacts combine with 32 amu of oxygen to give 36 amu of water
• C. 2 moles of hydrogen reacts with 1 mole of oxygen to give 2 moles of water
• D. All of the above

Answer 1

The correct option is D All of the above

For a reaction, $aA+bB\to cC+dD$

This means that $a$ moles of $A$ reacts with $b$ moles of $B$ to give $c$ moles of $C$ and $d$ moles of $D$.

We can say that a molecules of $A$ reacts with $b$ molecules of $B$ to give $c$ molecules of $C$ and $d$ molecules of $D$.

Therefore, 2 moles/molecules of hydrogen react with 1 mole/molecule of oxygen to give 2 moles/molecules of water.

Now converting moles into a mass by multiplying by molar mass, we get option $\left(B\right)$.

Hence, option D is correct.