Question

Which of the following equations is balanced?

H2 + O2→H2O + O2


2H2 + O2→2H2O


H2+ O2→H2O


4H2 + O2→H2O + O

Answer 1

the answer is the second one
hope that helps

Answer 2

Answer: The balanced equation is
`2H_2+O_2\rightarrow 2H_2O`

Step-by-step explanation:

A balanced chemical equation always follow law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This also means that total number of individual atoms on reactant side must be equal to the total number of individual atoms on the product side.

For the given options:

• Option 1:

The given chemical equation follows:

`H_2+O_2\rightarrow H_2O+O_2`

There are 2 atoms of hydrogen and 2 atoms of oxygen on the reactant side. There are 2 atoms of hydrogen and 3 atoms of oxygen on the product side.

As, total number of individual atoms are not equal on both the sides of the reaction. So, the reaction is not balanced.

• Option 2:

The given chemical equation follows:

`2H_2+O_2\rightarrow 2H_2O`

There are 4 atoms of hydrogen and 2 atoms of oxygen on the reactant side. There are 4 atoms of hydrogen and 2 atoms of oxygen on the product side.

As, total number of individual atoms are equal on both the sides of the reaction. So, the reaction is balanced.

• Option 3:

The given chemical equation follows:

`H_2+O_2\rightarrow H_2O`

There are 2 atoms of hydrogen and 2 atoms of oxygen on the reactant side. There are 2 atoms of hydrogen and 1 atom of oxygen on the product side.

As, total number of individual atoms are not equal on both the sides of the reaction. So, the reaction is not balanced.

• Option 4:

The given chemical equation follows:

`4H_2+O_2\rightarrow H_2O+O`

There are 8 atoms of hydrogen and 2 atoms of oxygen on the reactant side. There are 2 atoms of hydrogen and 2 atoms of oxygen on the product side.

As, total number of individual atoms are not equal on both the sides of the reaction. So, the reaction is not balanced.

Hence, the balanced equation is
`2H_2+O_2\rightarrow 2H_2O`