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In: Chemistry

A solution with a final volume of 500 mL was prepared by dissolving 25 mL of...

A solution with a final volume of 500 mL was prepared by dissolving 25 mL of methanol {CH2OH} (density = 0.7914) in chloroform {CHCl3}. Calculate its molar concentration. (MWMethanol = 32.00) (show the solution)

Solutions

Expert Solution

Mass of methanol = volume of methanol x density of methanol

= 25 ml x 0.7914 g/ml

= 19.785 g

Moles of methanol = Given mass / molar mass

= 19.785/ 32

= 0.618 mol

Concentration of methanol = moles of methanol / volume of solution (in L)

= 0.618 mol / 0.5

= 1.24 M


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