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- a) A container of compressed helium has in it 15.0 L pressurized to about 2250 kPa at 24.5°C. How many moles of helium are in the container? b) Determine the volume of oxygen gas required to completely combust 5.5 mol of propane (C3H8) in a barbecue at 101.3 kPa and 28.0°C. c) What mass of helium would be required to fill a balloon to 6.8 L at 100 kPa and 25°C?What is the partial pressure (in atm) of gasoline if 1 gallon of gasoline completely evaporates into a bedroom that is 12 ft x 14 ft x 8 ft? Assume 3.28 ft/m; 1000 L/m3; 3.785 L/gallon; MW (gasoline) = 114 g/mol; gasoline = 0.75 g/ml; R = 0.082 L.atm/mol.K; T = 298 K. Do not type commas, spaces, or unit of atm with your answer.When aluminum reacts with concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g)2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What mass of Al(s)Al(s) is required to produce 701.5 mL 701.5 mL of H2(g)H2(g) at STP?
- The execution manager of the lethal gas chamber in the state penitentiary adds excess dilute sulphuric acid H2SO4 to 196g of sodium cyanide NaCN. What volume of HCN is formed at STP in liters? At.wts are Na = 23, C = 12, N = 14 and H= 1 89.6 L 86.9 L 69.8 L 68.9 LA compound is found to be 30.45% N and 69.55 % O by mass. If 3.01 g of this compound occupy 780 mL at 25.0°C and 775 mm Hg, what is the molecular formula of the compound?The air bags in cars inflate through the explosive decomposition of a solid to produce a gas. The simplified version of the reaction that takes place in most air bags is shown. 2NaN3(s) -> 2Na(s) + 3N2(g) (a) If a typical air bag has a volume of 67.0 L when inflated, how much NaN3 (in grams) is required to inflate an air bag at STP? (b) Would you want to rely on an air bag that contained only 40.0 g NaN3? Explain.
- One of the best-selling light, or low-calorie, beers is 4.2% alcohol by volume and a 12-oz serving contains 110 calories, to estimate the percentage of calories that comes from alcohol, consider the following questions. Write a balanced chemical equation for the reaction of ethanol with oxygen to make carbon dioxide and water. If 4.2% of total volume of ethanol and the density of ethanol is 0.789 g/mL, what mass of ethanol does a 12-oz serving of light beer contains?How many liters, at STP, of CO2 are produced from 100.0 g of C8H18, the approximate formula of gasoline? 2C8H18(ℓ) + 25O2(g) → 16CO2(g) + 18H2O(ℓ)Chemistry - Your lungs are 5.23 L and 310.0 K at 1.01 atm. If 80.0% of the air is N2 and 20.0% is O2 what is the mass of gases in your lungs? - A person exhales about 11,100L of air per day. That air is 20.0% O2 going in and 15.0% O2 going out. If the temp is 23C and the pressure is 1.09 atm find the number of moles of O2 consumed in a day by a human breathing. - If a balloon was blown up to 1.47L at a pressure of 747torr and 309K originally, then taken out into the cold and saw the volume drop to 0.750L find the temperature outside in Kelvin?
- What volume in liters is occupied by 20.6 g of C2H2 at 734 mm Hg and 69° C?Which one of the following statements about the following reaction is false? CH4(g) + 2O2(g) CO2(g) + 2H2O(g) Every methane molecule that reacts produces two water molecules. If 32.0 g of oxygen reacts with excess methane, the maximum amount of carbon dioxide produced will be 22.0 g. If 11.2 liters of methane react with an excess of oxygen, the volume of carbon dioxide produced at STP is (44/16)(11.2) liters. If 16.0 g of methane react with 64.0 g of oxygen, the combined masses of the products will be 80.0 g. If 22.4 liters of methane at STP react with 64.0 g of oxygen, 22.4 liters of carbon dioxide at STP can be produced.1. Answer the following questions: a. At STP, 5.50 mol of gas occupies approximately what volume in liters? b. What is the volume in liters of 7.40 moles of CO₂ at standard temperature and pressure (STP)? c. What is the mass (in grams) of 24.00 L of propane vapor (C₃H₈) at STP? d. What quantity in moles of chlorine gas at 120.0 °C and 33.3 atm would occupy a vessel of 37.5 L? e. What is the pressure (in atm) in a 5.00 L tank with 15.00 grams of oxygen gas at 350 K? f. What is the temperature (in K) of 0.290 moles of neon in a 2.00 L vessel at 4.68 atm? g. 1.35 g of an unknown gas at STP fills a 500. mL flask. What is the molar mass of the gas?