SUPPLEMENTAL QUESTIONS FOR CHEM 1A EXAM #5 The following questions are provided to supplement your studying efforts for the first exam. I suggest you use these problems as practice exams, so try them WITHOUT your notes or text available, do them in a quiet place with all distractions silenced, and give yourself some type of time limit in which to finish a set number of them. This will best simulate the exam environment. Based on class progress, the set of questions below may not be an exhaustive list I will make you aware of any changes to this question set if any needs to be made. When performing numerical calculations, pay attention to your significant figures!!! Questions in bold type are questions I consider to be more challenging. 1. Three 200.0 L tanks, each at 24 °C, are to be filled separately with the gases helium, chlorine, and argon. What mass of each gas, in g, must be placed inside ea
ch respective tank in order to create a pressure of 13.6 atm? 2. A sample of a noble gas has a density of 0.003749 g mL?1 at STP. What is the most likely identity of this noble gas? 3. A chemist traps a sample of gas in a balloon at an initial temperature of 42.2 °C. At a pressure of 1.000 atm, the gas collection balloon inflates to a volume of 22.6 mL. The entire experiment is placed into a chamber with a pressure of 2.000 atm and temperature of 55.9 °C. Find the new volume of the balloon, in mL. 4. A helium balloon is observed to shrink to 68% of its original volume when placed into a dry ice/acetone bath. If the balloon was originally at 22 °C, what is the temperature, in °C, in the bath? 5. The box below contains a visualized mixture of gas A (represented by the black circles) and gas B (represented by the white circles). If the partial pressure of gas A is 422 Torr, determine PT in the box, in Torr.