freezes at 5.5°C. The temperature at which a solution of 10 g of in 200 g of freeze is °C. (nearest integer value)

(The molal freezing point depression constant of is 5.12°C/m.)

Question

freezes at 5.5°C. The temperature at which a solution of 10 g of  in 200 g of  freeze is  °C. (nearest integer value)

(The molal freezing point depression constant of  is 5.12°C/m.)

Canvas Classes · Accepted Answer

Strategy:
 Calculate the molality of the butane solution in benzene and apply the freezing point depression formula.

Step 1: Calculate moles of butane ()
Molar mass .

Step 2: Calculate molality ()
Mass of benzene (solvent) = 200 g = 0.2 kg.

Step 3: Calculate 
.

Step 4: Find freezing point
Pure benzene freezes at 5.5°C.

Rounding to nearest integer: 1.

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