Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4 K. The ratio of molal elevation constant

Question

Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4 K. The ratio of molal elevation constant to molal depression constant () is

Canvas Classes · Accepted Answer

Strategy:
 Determine the constants  and  separately using the respective molalities and elevations/depressions. Then, find the ratio .

Step 1: Calculate 
 for  glucose solution.

Step 2: Calculate 
 for  glucose solution.

Step 3: Find the ratio

Comparing with the options: 1/2, 1/4, 1/3, 3/1. The value is 3, which corresponds to option (4). Note: Some sources mistakenly index , but the math yields 3.

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