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Question

a solution of an organic halide in benzene, C6H6, has a mole fraction of halide of 0.0821. express its concentration in terms of molality.

Answer 1

ok so molality= moles of solute/kgs of solvent

if the mole fraction of the organic halide is .0821 that means the mole fraction of the solvent (benzene) is .9179

lets just use 1 as the total number of moles

that means that there is

.9179 moles of solvent

convert moles to mass using the molecular weight of benzene which is

78 grams /mole

so

.9179 x 78 grams per mole

71.7 grams

so you get

.0821/71.7grams

but you got to convert that into kgs

so

.0821/.0717 kgs

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