how many grams of HCL is needed to produce 200 grams of hydrogen?

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  1. 2HCl ==> H2--not balanced
    mols H2 needed = grams/molar mass = 200/2 = 100 mols
    So you will need 200 mols HCl.
    g HCl = mols HCl x molar mass HCl

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