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26 June, 19:05

A chemistry student needs 45.00g of 4-methyl-2-pentanone for an experiment. He has available 0.50 kg of a 10.9% w/w solution of 4-methyl-2-pentanone in acetone. Calculate the mass of solution the student should use.

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  1. 26 June, 20:09
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    0.412 Kg of Solution

    Explanation:

    To solve this problem we will first find the number of grams of solute contained by the given amount of solution as,

    w/w% = weight of solute / weight of solution * 100

    Solving for weight of solute,

    Weight of solute = w/w% * weight of solution / 100

    Putting values,

    Weight of solute = 10.9 * 500 g / 100

    Weight of solute = 54.5 g

    Hence,

    54.5 g of solute was contained by = 500 g of solution

    So,

    45.0 g of solute will be contained by = X g of solution

    Solving for X,

    X = 45.0 g * 500 g / 54.5 g

    X = 412.84 g

    Or,

    X = 0.412 Kg of Solution
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