Mole fraction of in benzene is . The molality of in benzene is:

Question

Mole fraction of  in benzene is . The molality of  in benzene is:

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Strategy:
 Molality () is moles of solute per kilogram of solvent. Use the mole fraction of  to find the moles of solute and the corresponding moles (and mass) of the solvent (benzene).

Step 1: Use ratios for 1 mole of mixture
Moles of 
Moles of Benzene

Step 2: Calculate mass of solvent
Mass of Benzene .

Step 3: Calculate molality

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