3.2 grams of a compound with a molar mass of 96 g/mol dissolved in 50 grams of water gave a solution that freezes at -1.50 °C.K_f for water is 1.86 °C/m.The van't Hoff i factor for this solution is ________. A)0.83 B)1.2 C)0.21 D)0.17 E)2.0

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Quizplus · Accepted Answer

The van't Hoff factor (i) is calculated using the formula ΔTf = i * Kf * m, where ΔTf is the freezing point depression, Kf is the cryoscopic constant, and m is the molality. First, calculate the molality: m = (3.2 g / 96 g/mol) / (0.050 kg) = 0.6667 mol/kg. Then, ΔTf = 1.50 °C. Solving for i gives i = ΔTf / (Kf * m) = 1.50 / (1.86 * 0.6667) ≈ 1.2.

32 Grams of a Compound with a Molar Mass of 96