_H2+_Cl2->_HCl fill in the blanks if necessary.

H₂   +   Cl₂    →    2HCl

Explanation:

The given reaction expression is shown below:

      H₂   +   Cl₂    →    HCl

We are to balance this given reaction expression.

Let us do this mathematically;

       aH₂   +   bCl₂    →    cHCl

Conserving H :  2a  = c

                   Cl:   2b  = c

Now, let a  = 1, c  = 2 , b = 1

So:

            H₂   +   Cl₂    →    2HCl

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