Answer to Question #302118 in General Chemistry for Hutchii

Question

Find the mass of fructose (C6H12O6) present in a solution containing 9,370.0 mg acetic acid to elevate the boiling point by 9.1 degrees C. Kb is 3.08 degrees C/m.

Answer 1

We utilize the formula:

Δt = i K_b m (9370mg = 0.00937kg)

9.1 °C = (1) (3.08 °C kg mol¯¹) (x / 0.00937 kg)

9.1 °C = (328.71 °C mol¯¹) (x)

x = 0.027684 mole

Mass of fructose:

0.027684 mol × 180.1548 g/mol =4.99g