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i find it confusing on how to do this question..
what mass of solute is needed to prepare 400 mL of 0.850 M CuSO4 from CuSO4.5H2O

  • chemistry -

    Molar mass CuSO4.5H2O = 249.69 g/mol

    You want 400ml of 0.85M: 249.69 *400/1000*0.85 = 84.9g CuSO4.5H2O dissolved to total volume 400ml.

  • chemistry -

    The confusing part here is that you want a solution of CusO4 but you have given CuSO4.5H2O to make it.
    What to remember. 1 mol CuSO4 = 1 mol CuSO4.5H2O; therefore, you want how many mols CuSO4? That's
    M x L = 0.850 x 0.400 = ?
    But that's the same number of mols you want for CuSO4.5H2O also; therefore
    g = mols x molar mass and
    g CuSO4.5H2O = mols CuSO4 x molar mass CuSO4.5H2O

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