45 g of ethylene glycol (molar mass 62 g/mol) is mixed with 600 g of w…

Question

45 g of ethylene glycol (molar mass 62 g/mol) is mixed with 600 g of water (Kf = 1.86 K kg/mol). The depression in freezing point is approximately:

Accepted Answer

C. 2.2 K

1. Moles of glycol = $45 / 62 = 0.73$ mol.
2. Molality = $0.73 / 0.6 = 1.2$ m.
3. $\Delta T_f = K_f m = 1.86 	imes 1.2 = 2.2$ K. (Option A is the molality, not $\Delta T_f$.)
_Source: syllabus Chemistry Ch 1 "Solutions", p.19_

Answer

1.2 K

Answer

0.73 K

Answer

3.7 K

45 g of ethylene glycol (molar mass 62 g/mol) is mixed with 600 g of water (Kf = 1.86 K kg/mol). The depression in freezing point is approximately:

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