Asolution was prepared by dissolving 2.2 g of an unknown solute in 16.7 g of ccl4. a thermal analysis was performed for this solution and it was found that its initial freezing point was – 28.7°c. a reliable source in the bibliography states that for ccl4, t°f = – 22.9°c, and its freezing point lowering constant is kf = 29.9°c/m. calculate the molar mass of the unknown solute.

Molar mass of unknown solute is 679 g/mol

Explanation:

Let us assume that the solute is a non-electrolyte.

For a solution with non-electrolyte solute remains dissolved in it -

Depression in freezing point of solution,

where, m is molality of solute in solution and is cryogenoscopic constant of solvent.

Here

If molar mass of unknown solute is M g/mol then-

So,

so, M = 679 g/mol

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

i think that the answer is c