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    How can I balance the equation ##Zn + HCl -> ZnCl_2 + H_2##?

    ##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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