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2 June, 13:08

Calculate your experimentally determined percent mass of water in Manganese (II) sulfate monohydrate. Report your result to 2 or 3 significant figures, e. g. 9.8% or 10.2%.

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  1. 2 June, 13:17
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    10.6%

    Explanation:

    The determined percent mass of water can be calculated from the formula of the hydrate by

    dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and

    multiplying this fraction by 100.

    Manganese (ii) sulphate monohydrate is MnSO4. H2O

    1. Calculate the formula mass. When determining the formula mass for a hydrate, the waters of

    hydration must be included.

    1 Manganes 52.94 g = 63.55 g

    1 Sulphur 32.07 g =

    32.07 g 2 Hydrogen is = 2.02 g

    4 Oygen =

    64.00 g 1 Oxygen 16.00 = 16.00 g

    151.01 g/mol 18.02 g/mol

    Formula Mass = 151.01 + (18.02) = 169.03 g/mol

    2. Divide the mass of water in one mole of the hydrate by the molar mass of the hydrate and

    multiply this fraction by 100.

    Percent hydration = (18.02 g / 169.03 g) x (100) = 10.6%

    The final result is 10.6% after the two steps calculations
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