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10 January, 03:12

In the laboratory you are asked to make a 0.303 m cobalt (II) sulfate solution using 275 grams of water. How many grams of cobalt (II) sulfate should you add?

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  1. 10 January, 03:58
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    Answer: 12.92g of CoSO4

    Explanation:

    Molar Mass of CoSO4 = 59 + 32 + (16x4) = 59 + 32 + 64 = 155g/mol

    Molarity of CoSO4 = 0.303mol/L

    Mass conc. In g/L = Molarity x molar Mass

    = 0.303x155 = 46.965g/L

    275 grams of water = 0.275L of water

    46.965g of CoSO4 dissolves in 1L

    Therefore Xg of CoSO4 will dissolve in 0.275L i. e

    Xg of CoSO4 = 46.965x0.275 = 12.92g

    Therefore 12.92g of CoSO4 is needed
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