Question

Need help with this please thanks

Answer 1

Answer: 1.
`2H_2+O_2\rightarrow 2H_2O`

2.
`P_4+3O_2\rightarrow 2P_2O_3`

3.
`N_2+3H_2\rightarrow 2NH_3`

4.
`2K+Cl_2\rightarrow 2KCl`

Step-by-step explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The given equations are balanced as:

1.
`2H_2+O_2\rightarrow 2H_2O`

2.
`P_4+3O_2\rightarrow 2P_2O_3`

3.
`N_2+3H_2\rightarrow 2NH_3`

4.
`2K+Cl_2\rightarrow 2KCl`