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Zinc combines with hydrochloric acid to form aqueous zinc chloride and hydrogen gas.  If 300.0 mL of a 0.150  M solution of HCl is allowed to react with excess zinc, how many moles of hydrogen gas would be produced? Part two: if this reaction happens at STP what volume of hydrogen gas is produced?  (write a balanced equation first)

  • chemistry -

    Write and balanced the equation.
    Zn + 2HCl ==> ZnCl2 + H2

    How many moles HCl do you have? That's M x L = 0.150 x 0.300 = ??

    Use the equation to convert mols HCl to moles H2.
    mols H2 = moles HCl x (1 mol H2/2 mols HCl) = moles HCl x (1/2) = ? = moles H2.

    If at STP, the volume will be
    ?mols H2 x 22.4 L/mol = ? L H2 @ STP.

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