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16 April, 09:55

Calculate the percentage by mass of water in magnesium sulfate heptahydrate, MgSO4•7H2O

Enter your answer with 3 significant figures

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Answers (2)
  1. 16 April, 11:46
    0
    The percentage by mass of water in magnesium sulfate heptahydrate is 51.2 %

    Explanation:

    Step 1: Data given

    Molar mass of MgSO4*7H2O = 246.5 g/mol

    Molar mass of H2O = 18.02 g/mol

    Molar massof MgSO4 = 120.37 g/mol

    Step 2: Calculate % water in magnesium sulfate heptahydrate

    Since we have 7 molecules of water in the heptahydrate, we will divide the molar mass of 7 molecules water by the molar mass of the heptahydrate.

    m% (H2O) = (7*18.02) / 246.5

    m% (H2O) = (126.14 / 246.5) * 100%

    m% (H2O) = 51.2 %

    To controle this we will calculate the mass % of MgSO4

    m% (MgSO4) = (120.37 / 246.50) * 100%

    m% (MgSO4) = 48.8%

    51.2 + 48.8 = 100%

    The percentage by mass of water in magnesium sulfate heptahydrate is 51.2 %
  2. 16 April, 13:28
    0
    Answer:from reffered dfn of %by mass

    %by M=mass of component particular/total mass

    But mass directly proportional to Molar mass

    % by M=molar mass of H2O cpn/total M

    %by M=7 ((1*2) + 16) / (7 ((1*2) + 16) + (24 + (16*4) + 32))

    =0.573
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