Question

the equation for water is h₂ + o₂ → h₂o. to balance the equation, which coefficient should be placed in front of h₂ and h₂o?
1
2
3
4

Explanation:

Step1: Analyze oxygen atoms

The un - balanced equation is $H_2+O_2
ightarrow H_2O$. On the left - hand side, there are 2 oxygen atoms in $O_2$, and on the right - hand side, there is 1 oxygen atom in $H_2O$. To balance the oxygen atoms, we need 2 moles of $H_2O$. So the equation becomes $H_2 + O_2
ightarrow2H_2O$.

Step2: Analyze hydrogen atoms

Now, in $2H_2O$, there are 4 hydrogen atoms on the right - hand side. So we need 2 moles of $H_2$ on the left - hand side to balance the hydrogen atoms. The balanced equation is $2H_2+O_2 = 2H_2O$.

Answer:

B. 2