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homework help 7463

##Zn +2HCl -> ZnCl_2 + H_2 ##

The method I find it 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 = ZnCl2 + H2Reactant side:
Zn= 1
H=1 X 2 =2 moles of hydrogen
Cl=1 X 2 = 2 moles of

Product side:
Zn=1
H=2
Cl=2

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

Balanced chemical equation:
Zn + 2HCl = ZnCl2 + H2

There are two hydrogens and two chlorines on the left and right sides.

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