Question #bed9f

1 Answer

Answer:

#"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 #