Suresh R. answered 07/26/14
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As you have not given the other reactant and only mentioned 6 moles of HCl, and chemical equations generally represent mole to mole proportionality, any reaction balanced with 6 HCl could be the answer to your question. Here is another example:
Fe2(CO3)3 + 6HCl → 2FeCl3 + 3H2CO3; H2CO3 will further decompose.
You could be referring to a titration lab experiment where acid is being neutralized by a base of certain concentration. 6M is referring to the strength or concentration of the acid you are using - 6 Molecular weights of HCl in One Litre of Solution.
More specific answers can be given if you know the other reactants involved.