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HELP PLEASE A stock solution containing Mn2+ ions was prepared by dissolving 2.763g pure manganese metal in nitric acid and diluting to a final volume

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A stock solution containing Mn2+ ions was prepared by dissolving 2.763g pure manganese metal in nitric acid and diluting to a final volume of 1.000L. The following solutions were then prepared by dilution: For solution A,55.00mL of stock solution was diluted to 1500.0mL. For solution B, 10.00mL of solution A was diluted to 200.0mL. For solution C,20.00mL of solution B was diluted to 450.0mL. Calculate the concentration of the stock solution. Molarity = M

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