Question

Mole fraction in benzene of iodine is 0.2 than what is the molality of benzene ?

A)2.35 B)3.20 C)2.75 D)3.6

Answer 1

mole fraction = 0.2. therefore in 100 moles, 20 moles are of solute and 80 moles are of benzene(solvent) mass of benzene = 80 * Mol.Wt of Benzene = 80* 78 = 6240g for 6240 g of solvent we have 20 moles of solute Therefore for 1000g of solvent we have (20)*(1000)/(6240) = 3.20 molal