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7 January, 12:23

1. What is the molarity of 6.4g of methanol dissolved in 50 moles of water2. If the density of the above solution at 25C is 1.03kg/L what is the molarity methanol solution at 25°C

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  1. 7 January, 13:58
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    1. 0.22 mol/dm³

    2. 0.23 mol/dm³

    Explanation:

    Molarity: This can be defined as the concentration of a substance in mol per dm³

    1.

    M = n/v ... Equation 1

    M = molarity of methanol, n = number of mole of methanol, v = volume of the solvent/water/solution.

    n = g/m. m

    Where g = mass of methanol, m. m = molar mass of methanol.

    g = 6.4 g, m. m = 32 g / mole.

    n = 6.4/32 = 0.2 mole

    and,

    v = m/d

    Where m = mass of water, d = density of water

    m = mass of 50 moles of water = 18*50 = 900 g.

    d = 1000 g/dm³.

    v = 900/1000 = 0.9 dm³

    Substituting the value of v and n into equation 1

    M = 0.2/0.9

    M = 0.22 mol/dm³

    2.

    M = n/v

    v = volume of the solution

    v = (mass of methanol + mass of water in the solution) / density of the solution

    v = [ (900+6.4) / 1000]/1.03

    v = 0.9064/1.03

    v = 0.88 dm³

    n = 0.2 mole

    Therefore,

    M = 0.2/0.88

    M = 0.23 mol/dm³
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