Answer:
Freezing point of the solution will be -65.9°C
Step-by-step explanation:
The addition of a solute to a solvent decreases freezing point of pure solvent. Freezing point depression formula is:
ΔT = K×m
Where ΔT is change in freezing point (-63.5°C is freezing point of pure chloroform), K is solvent constant (4.68°Ckg/mol for chloroform) and m is molality (moles of solute per kg of solvent).
Moles of benzene are:
6.50g × (1mol / 78.11g) = 0.0832 moles of benzene
0.0832 mol / 0.160kg = 0.52 mol/kg of solution.
Replacing these values in the formula:
(-63.5 - X)°C = 4.68°Ckg/mol× 0.52 mol /kg
X = -65.9°C
Freezing point of the solution will be -65.9°C