. The melting point of ethanol CH3CH2OH is -117.300 C at 1 atmosphere (Kf(ethanol) = 1.99 C/m). In a laboratory experiment, students synthesized a new compound and found that when 10.60 grams of the compound were dissolved in 241.0 grams of ethanol, the solution began to melt at -117.778 0 C. The compound was also found to be nonvolatile and a nonelectrolyte. What is the molecular weight they determined for this compound? show the work
Kf = 1.99 oC/m
delta Tf = To - Tf
= - 117.300 - (- 117.778)
= 0.478 oC
delta Tf = Kf x m
0.478 = 1.99 x m
m = 0.240
molality = moles / mass of solvent
0.240 = moles / 0.241
moles = 0.0579
moles = mass /molar mass
0.0579 = 10.60 / molar mass
molar mass = 183.1 g/mol
. The melting point of ethanol CH3CH2OH is -117.300 C at 1 atmosphere (Kf(ethanol) = 1.99...
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