Discussion Worksheet #11_KEY

Discussion Worksheet #1 1 - GASES _KEY Simple gas laws Fill in the blank with the word increases, decreases, or does not change. a. As volume increases, pressure _____ decreases ________________. b. As moles increase, volume ________ increases ____________. c. As temperature decreases, pressure _____ decreases _______________. Use the combined gas law to solve the following problems. a. A sample of gas has an initial volume of 5.6 L at a pressure of 0.967 atm. If the volume of the container is increased to 9.4 L, what is resulting pressure? Report your answer in atm. 0.58 atm b. A balloon contains 0.158 mol of gas and has a volume of 2.46 L. If we add 0.113 mol of gas to the balloon, what is the resulting volume of the balloon? Report your answer in L. (assume constant temperature and pressure) 4.22 L c. Aerosol cans carry clear warnings against incineration because of the high pressures that can develop if they are heated. Suppose that a can contains a residual amount of gas at a pressure of 755 mmHg and a temp of 25°C. What would the pressure of the residual gas inside the container be if it were heated to 1155°C? Report your answer in atm. 4.76 atm Ideal gas law A 6.35-gram sample of argon is held at STP conditions. What volume does it occupy? 3.56 L How many moles of gas are in a 30.0L scuba canister if the temperature of the canister is 300. K and the pressure of the gas inside the canister is 200. atm? 244 mol A piece of dry ice (solid CO 2 ) with a mass of 28.8g sublimes (converts from solid to gas) into a large balloon. If all of the carbon dioxide ends up in the balloon, what is the volume (in L) of the balloon at a temperature of 22°C and a pressure of 742 Torr? 16.2 L Gas Stoichiometry How many grams of methane gas are required to completely react with 103-L of oxygen gas at STP? CH 4 (g) + 2 O 2 (g) → CO 2 (g) + 2 H 2 O (l) 36.8 g Given the following chemical equation, what volume (in L) of CF 4 , collected at 47.0°C and 985 Torr, would be produced following the reaction of 0.315 g of C 2 H 4 in excess fluorine gas? C 2 H 4 (g) + 6F 2 (g)  2CF 4 (g) + 4HF (g) 0.456 L