Question

Question #bed9f

Answer 1

`"Zn" +2"HCl" -> "ZnCl"_2 + "H"_2`

Explanation:

The method I find useful when it comes to balancing a chemical equation is to draw a chart corresponding to the number of moles: (Split compounds into one unit of its own but, for polyatomic count them as one whole unit)

Unbalanced chemical equation:

`"Zn " + " HCl" -> "ZnCl"_2 + "H"_2`

The reason you need to balance a chemical equation is because energy is conserved throughout the chemical process.

Reactant side:

• `"Zn"= 1`
• `"H" =1`
• `"Cl" = 1`

Product side:

• `"Zn" = 1`
• `"H" = 2`
• `"Cl" = 2`

You need two hydrogens and two chlorines on the left and right sides, so multiply `"HCl"` by `2`

Reactant side:

• `"Zn"= 1`
• `"H" =1 xx 2 = "2 moles of H"`
• `"Cl" = 1 xx 2 = "2 moles of Cl"`

Product side:

• `"Zn" = 1`
• `"H" = 2`
• `"Cl" = 2`

The balanced chemical equation:

`"Zn" + 2"HCl" -> "ZnCl"_2 + "H"_2`