University:
Eastern Kentucky University
Course:
CHE 111 | General Chemistry
Academic year:

2023
Views:

83

Pages:

2
Author:

rehinhea0c

Unit 3 Properties of Gases Chemistry Problem Set Screencast 3-5 Problems 30. Lowering the temperature of a system causes deviations from the ideal gas law. Explain. Lowering the temperature causes a decrease in the molecular motion which causes the space that is between the molecules to become smaller, make the assumption that the space between the molecules no longer negligible. The molecules will then be attracted to each other and the volume of the molecules themselves cannot be neglected in the equation 31. A real gas will behave more like an ideal gas when the pressure of a system decreases and the temperature remains the same. Explain. This is because as the pressure decreases the volume of a gas increases at constant temperature making the space between the molecules larger, thus there is no force of attraction between the molecules 32. The following questions pertain to a system contains 122 g CO(g) in a 0.400 L container at -7.1oC. a. Calculate the pressure exerted by the CO(g) in this system using the ideal gas equation. b. The actual pressure exerted by the carbon monoxide was found to be 145 atm. Explain why the actual pressure is less than what would be expected Unit 3 Properties of Gases Chemistry Problem Set 33. The normal boiling points of CO and SO2 are -192oC and -10oC, respectively. a. At 25oC and 1 atm, which gas would you expect to have a molar volume closest to the ideal value? CO – it has a lower boiling point make the difference between the boiling point and 25o more significant and because it is a much smaller molecule (smaller molar mass) b. If you wanted to reduce the deviation from ideal gas behavior in what direction would you change the temperature? The pressure? 34. A sample of methane gas (CH4) is at 50oC and 20 atm. Would you expect it to behave more or less ideally if a. The pressure was reduced to 1 atm? b. The temperature was reduced to -50 oC?