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21 February, 01:20

Calculate the molarity of a solution obtained dissolving 10.0 g of cobalt (Ⅱ) bromide hexahydrate in enough water to make 450 mL of solution 7.64 * 10-2 6.80 * 10-2 0.102 M 8.55 * 10-2 6.80 * 10-5

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  1. 21 February, 02:44
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    The molarity of this solution is 6.8 * 10^-2 M

    Explanation:

    Step 1: Data given

    Mass of CoBr*6H2O = 10.0 grams

    Molar mass of cobalt (Ⅱ) bromide hexahydrate =

    Volume of the solution = 450 mL = 0.450 L

    Step 2: Calculate moles of cobalt (Ⅱ) bromide hexahydrate

    Number of moles = Mass / molar mass

    Number of moles = 10.0 grams / 326.85 g/mol

    Number of moles = 0.0306 moles

    Step 3: Calculate molarity of the solution

    Molarity = number of moles / volume

    Molarity = 0.0306 moles / 0.450L

    Molarity = 0.068 M = 6.8 * 10^-2 M

    The molarity of this solution is 6.8 * 10^-2 M
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