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An unknown sample weighs 0.2436 g was dissolved in 20.0 mL of cyclohexane (density = 0.779...

An unknown sample weighs 0.2436 g was dissolved in 20.0 mL of cyclohexane (density = 0.779 g/mL). The freezing point depression (∆Tf) was 2.5°C. Calculate the molar mass of the unknown substance. (Kf = 20.5 °C/m)     ∆Tf = Kf m where Kf is the freezing point depression constant and m is molality.

526 g/mol

1.50 g/mol

128 g/mol

2.44 g/mol
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