If you dilute a 20.0 mL of a 3.5M solution to make 90.0 mL solution what is the molality of the dilute solution? Given:

unknown:

show work:

Molality of the diluted sample is 0.778 M

Explanation:

Given -

Molality of the original  solution = 3.5 M

Volume of the original solution = 20 mL

Volume of the diluted solution = 90 mL

Molality of the diluted sample =  X

As we know

Molality of the original  solution * Volume of the original solution = Volume of the diluted solution * Molality of the diluted sample

Substituting the given values, we get -

M

Molality of the diluted sample is 0.778 M

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