Question

PLEASE HELP MEEEEE (using 98 points to post)

Given that the molal freezing point depression constant (kf) for methyl alcohol (CH3OH) is -0.83 oC/molal, how much will the freezing point of methyl alcohol be lowered if 46.0 g of glycerine (C3H8O3) is added to 1.00 kg of methyl alcohol? (must show work, correct unit and correct answer)

Answer 1

29.2 g/mol is your answer

Answer 2

Δt = i Kf m

2.86 °C = (1) (1.86 °C kg mol-1) (x / 0.750 kg)

2.86 °C = (2.48 °C mol-1) (x)

x = 1.1532 mol

33.7 g / 1.1532 mol = 29.2 g/mol