Question

Balance the reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1."

HCl + Zn → ZnCl2 + H2

Answer 1

2HCL + Zn = ZnCl2 + H2

So there are H=2
Zn=1 and Cl=2

Answer 2

Answer:
`2HCl+Zn\rightarrow ZnCl_2+H_2`

Step-by-step explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.

A general single displacement reaction can be represented as :

`A+BC\rightarrow AC+B`

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 balanced chemical equation will be :

`2HCl+Zn\rightarrow ZnCl_2+H_2`