Question

Which of the following equations is balanced? a b C d H2 + O2 → H₂O 2H2 + O2 → 2H₂O H₂+202 → 2H₂O 2H2 + O2 → H₂O​

Answer 1

The balanced equation among the given equation is:

`2H_2\ + O_2\ \rightarrow\ 2H_2O` (option B)

How to know which equation is balanced?

A balanced equation has equal amount of the elements in the reactants and products.

We shall determine which equation is balanced as follow:

For option A:

`H_2\ + O_2\ \rightarrow\ H_2O`

Reactant:

• H = 2
• O = 2

Product:

• H = 2
• O = 1

Thus, the equation is not balanced

For option B:

`2H_2\ + O_2\ \rightarrow\ 2H_2O`

Reactant:

• H = 4
• O = 2

Product:

• H = 4
• O = 2

Thus, the equation is balanced

For option C:

`H_2\ + 2O_2\ \rightarrow\ 2H_2O`

Reactant:

• H = 2
• O = 4

Product:

• H = 4
• O = 2

Thus, the equation is not balanced

For option D:

`2H_2\ + O_2\ \rightarrow\ H_2O`

Reactant:

• H = 4
• O = 2

Product:

• H = 2
• O = 1

Thus, the equation is not balanced

From the above, the correct answer is option B