Pure benzophenone freezes at 48.1 °C. A solution of 1.25 g of biphenyl (C12H10; molar mass = 154.2 g/mol) plus 25.38 g of benzophenone froze at 16.8 °C. Calculate the Kf of benzophenone: ΔTf = Tsolvent - Tsol = KfmΔTf = 42.1 - 16.2 = 25.9 °CKf = ΔTf / m = 25.9 / (31.3 * 0.042) = 25.9 / 1.31546 = 19.68 °C/mA mixture of 1.03 g of unknown plus 23.94 g of benzophenone had the following cooling behavior:time, mintemperature, °C0.0 24.11.0 23.02.0 21.83.0 20.84.0 19.85.0 18.86.0 17.77.0 16.78.
Pure benzophenone freezes at 48.1 °C. A solution of 1.25 g of biphen…
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