Calculate the freezing point depression and molality for the benzoic acid solution and the freezing point depression constant for dodecanoic acid K_f, including uncertainty.

data:

molar mass (Dodecanoic acid)=200.32g/mol

molar mass (benzoic acid)=122.12g/mol

mass (benzoic acid)=0.9988g

mass(Dodecanoic acid)=7.2969g

Freezing temperature T_f of dodecanoic acid=43.550C

Freezing temperature T_f of the mixture of dodecanoic acid and benzoic acid solution=38.339C