An unknown organic substance thought to be meth C10H15N at a lab. The kf Of C6H6

Question

An unknown organic substance thought to be meth C10H15N at a lab. The kf Of C6H6 is 5.12 C. 1.350 grams of it was dissolved in 10 g of benzene and it froze at 3.66 instead of 5.50C.
What is the molar mass?
What is the mole fraction of the substance in the benzene assuming it is meth An unknown organic substance thought to be meth C10H15N at a lab. The kf Of C6H6 is 5.12 C. 1.350 grams of it was dissolved in 10 g of benzene and it froze at 3.66 instead of 5.50C.
What is the molar mass?
What is the mole fraction of the substance in the benzene assuming it is meth
What is the molar mass?
What is the mole fraction of the substance in the benzene assuming it is meth

Explanation / Answer

T -Tf = Kf * m

(5.5 - 3.66) = 5.12 * (1.35/x) * (1000/10)

Molar mass x = 375.65 g / mol

mole fraction = (1.35 / 375.65) / ((1.35/375.65) + (10 / 78))

molefraction = 0.02726

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