Consider the following boiling point data and decide which liquid has the highes

Question

Consider the following boiling point data and decide which liquid has the highest vapor pressure at room temperature: a) Water, H_2O 100degreeC b) Methanol. CH_3OH 64.96degreeC C) Ethanol. CH_3CH_2OH 78.5degreeC d) Diethyl ether, CH_3CH_2-O-CH_2CH_3 34.5degreeC e) Ethylene glycol HO-CH_2-CH_2-OH 198degreeC 2. Given the graph below, what is the boiling point of carbon tetrachloride at standard pressure? a) 60degreeC b) 34degreeC c) 98degreeC d) 77degreeC 3. The heat of fusion of a compound_the heat of vaporization for that compound. a) is always greater than b) can be the same as c) Is always less than d) is same magnitude as. but the opposite sign of 4. What is the vapor pressure of water at 70degreeC? a) 5.00 atm b) 1.20 atm c) 1.00 atm d) 0.31 atm 5. Consider two liquids, A and Liquid A exhibits stronger intermodular forces than liquid Which of the following is true? a) The surface tension of liquid A and the viscosity of liquid A are greater than those of liquid b) The surface tension of liquid A is greater than that of liquid The viscosity of liquid B is greater than that of liquid c) The surface tension of liquid B is greater than that of liquid The viscosity of liquid A is greater than that of liquid d) The surface tension of liquid B and the viscosity of liquid B are greater than those of liquid

Explanation / Answer

Boiling point at 760mm Hg= 77 deg.c

heat of fusion is less than heat of vaporization since from solid to vapor, the degress of disorder increases.

from the grpah, the vapor pressure of water at 70deg.c is =230 mm Hg

higher the intermolecualr forces , higher the surface tension and higher the viscosity of liquid A than B.

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