M3-2 Chemistry 20 Assignment

Dr. Zheng 10/17, 2019 CHEMISTRY 20 SUMMER SCHOOL ASSIGNMENT M3-2 Module 3: Behavior of Gases (Molar Volume of Gases and Ideal Gas Law) Your diagrams can be submitted in one of the following ways: 1) Using a drawing tool on your computer, or 2) Scanning your diagram as a pdf or jpg and uploading it to the drop box 1. Hydrogen cyanide gas is produced industrially by this reaction: 2 CH 4 (g) + 3 O 2 (g) + 2 NH 3 (g) → 2 HCN(g) + 6 H 2 O(g) What volumes of O 2 (g) and NH 3 (g) are needed to react with 8.0 L of CH 4 (g) at STP? A. 12 L of O 2 (g) and 8 L of NH 3 (g) B. 4 L of O 2 (g) and 8 L of NH 3 (g) C. 8 L of O 2 (g) and 12 L of NH 3 (g) D. 12 L of O 2 (g) and 4 L of NH 3 (g) Answer: 2. Use the following balanced equation to answer the question. 2 H 2 (g) + O 2 (g) → 2 H 2 O(g) If 10.0 L of hydrogen reacted with 5.0 L of oxygen, the volume of water vapour formed is A. 2.0 L B. 5.0 L C. 10 L D. 15 L Answer: 3. Three 1.0-L flasks contain He(g), N 2 (g), and H 2 S(g) at SATP. Which statement indicates the relative number of molecules in the flasks? A. The flask of He(g) contains the most molecules. B. The flask of N 2 (g) contains the most molecules. C. The flask of H 2 S(g) contains the most molecules.

D. All three flasks contain the same number of molecules. Answer: 4. Hydrogen gas can be used in weather balloons because of its low density. The volume occupied by 3.00 mol of hydrogen at SATP is A. 6.23 L B. 67.2 L C. 73.6 L D. 73.4 L Answer: 5. A 2.50-L balloon contains 0.100 mol of air at 115 kPa pressure. The temperature of the air in the balloon is A. 30°C B. 73°C C. 100°C D. 346°C Answer: 6. Examine the following statements made by students. I. Pressure is directly proportioned to temperature when all other variables are held constant. II. Pressure is directly proportioned to volume when all other variables are held constant. III. Volume is directly proportioned to temperature when all other variables are held constant. IV. The number of moles is directly proportioned to volume when all other variables are held constant. Which statements apply to ideal gases? A. I and II B. II and III C. I and III D. I, III, and IV Answer: 7. Chlorine, a poisonous yellow gas, can be produced by mixing vinegar and bleach for a cleaning solution. The volume occupied by 150 g of chlorine at –12.5°C and

12. If 77.60 g of nitrogen gas are produced in a reaction, what is the volume if the temperature is 48°C and the pressure is 99.5 kPa? Answer: 13 . What is the density (in g/L) of a sample of SO 2 at 932 mmHg and 65°C? Answer: Once you have completed all of the questions, submit your work to Dropbox M3-2.