26. Which of the following stalements is taise for the vagor pressuaretemperature diagram shoin: A) The vapor pressure for C at 60 is about 0.4atm B) Substance D has the weakest binding forces C) The normal boiling point for A is about 58 D) To achieve a vapor pressure of 0.4 atm, substance D must be heated to 952C E) All the answers are coerect 27. Acetic acid has a heat of fution of 10.8kJ mol and a heat of vaporzation of 24.3kal/mol. What is the expected value for the heat of tublimation of acetic acid? A) 35.1 kliencl B) 13.5kmimol C) +13.5kJlm al D) 35.1k.limol E) Not enough information is given to anceeer the question. 28. A phase change from the gas phase directyy to the solid phase is called: A) Sublimation B) Condensation C) Freezing D) Melting E) Deposition 29. Find the temperature at which ethanol bols on a dyy in the mountains when the barometric pressure is $47mmHg. (Given. The heat of vaporization of ethanol is 39.3kJ/mol, the normal boling point of eftand is 7b. 3'C.) A) 10.0+C B) 69.9+C C) 74.6C D) 76.5+C E) 77,9C 30. Based on the phase diagram shown below, how wil the meiting point of the substance change if the pressune is increased above 1 atm? CHEMTO2 Heme Work. 2 Chapter 11: Intermolecular forces and Fiquids and selids A) The meting point will decrease. B) The meting poirt will remain the same. C) The meling point will increase. D) The substance will not melt at pressures of 1 atm and above E) The solid sublimes to form the gas phase 31. a. Ethanol and dimethyt ether have the same moiecular formula. CaHuO. Ethanol boils at 78.4C. Dimethyl ether bols at 23.7C. Their structural formulas are, respectively. CH,CH,OAt and CH,OCH. Explain why the boling point of the ether is so much lower than the bolling point of ethand. b. The meniscus for water is curved upward at the edges f.e., it is "concave 4p"). Explain this phenomenon in lemtm of cohesion and adhesion