2.consider a 20 l sample of moist air at 60 °c under a total pressure of 1 atm. in which the partial pressure of water vapor is 0.120 atm. assume the mole % composition of dry air is: 78% n2; 21% o2; 1% ar. a) what are the mole percentages of each of the gases in the sample? b) what volume must the mixture occupy at 60 °c if the relative humidity is to be 100%? (relativehumidity is defined as pw/pwox100 where pwis the partial pressure of water vapor in the sample and pwois the equilibrium vapor pressure of water at that temperature. at 60 °c pwo= 0.197 atm.) your answer should be in liters.

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.