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13 February, 09:53

Find the molality of the solution if 42 grams of lithium chloride (LiCl) are dissolved in 3.6 kg of water.

0.275 m

11.7 m

0.990 m

0.857 m

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  1. 13 February, 13:24
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    The molality is calculated using the following rule:

    molality = number of moles of solute / kg of solvent

    From the periodic table:

    molar mass of lithium = 6.941 gm

    molar mass of chlorine = 35.453 gm

    molar mass of LiCl = 6.941 + 35.453 = 42.394 gm

    number of moles found in 42 gm = mass / molar mass = 42 / 42.394 = 0.99

    molality = 0.99 / 3.6 = 0.275 m
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