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Q: Calculate the mL of oxygen produced from 0.475 g of potassium chlorate at STP. 2KClO3 ⟶⟶ 2KCl + 3O2
A: Given that : Mass of KClO3 = 0.475 g The molar mass of KClO3 is 122.55 g/mol
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- 9:38 نقطتان )2( Q1. The volume of air(N2 and 02) needed for complete combustion of 1 kg of propane * -:(C3H8 ) is 21 O 15.9 O 18.8 O 23.8 O ع غ ف ق ث ص ض ي س ش 123 مسافة اذهب J.1.The following results have been obtained for the density of nitrous oxide in grams per liter at several pressures at 0°C: 1 1.9804 2/3 1/2 Pressure (atm) Density 1.3164 0.9861 Determine the molecular weight of nitrous oxide and the atomic weight of Nitrogen. 1/3 0.6565H2O + H2O ⇔ H3O+1 + OH-1 [H3O+1][OH-1] Kw = ––––––––––––– = [H3O+1][OH-1] = (1 x 10-7)2 = 1 x 10-14 [H2O]2
- Consider the following data: HX → X- + H+ Ką = 6.61 · 10- 5 H2A + НА + Н + Ka = 2.68 · 10-7 Calculate the Keg for the following reaction: H2A + X¯ + HA¯ +HX Record your answer in scientific notation to 3 sig figs.Calculate the amount of CO2 emitted in jordan from gasolene ( C8H17) powered vehicles Assume the compustion is complete in All CASES gasolene Densety =720gm/L we regard to jordanian consumption of 90 octane 95 octane gasoline jordanian consumed 1.908000000 Liter during 20197) The most important reaction that allows our cars to do work is octane (CSH18) combustion 2 C8HI8 + 25 02 à 16 C02 + 18 H20 a) Theoretically speaking, if we fully combust 3.0 kg of octane, and keep the products at STR, what volume of gas do we expect to be produced? b) If the % yield for this combustion reaction is 90%, what is the actual volume? 8) Name two characteristics that describe real gases and not ideal gasses. 9) a) A climber takes a mole of ideal qgas to the top of Mount Everest, where the pressure is 304 torr and the temperature is subzero at -17° C. What is the volume of the gas? b) The gas taken to Mount Everest is oxugen gas. What is the root mean square velocity of gas molecules in that sample of gas? 10.) a) An 8.00L tank at 7.3° C is filled with 24 g of dinitrogen monoxide (N2O) and 8.2 g of sulfur hexafluoride gas (SF6). What is the mole fraction of sulfur hexafluoride? b) What is the ratio between the rates of effusion of sulfur hexafluoride and dinitrogen…
- 2.) It’s a bad day in the lab! Two students are doing experiments. Each is 20 feet away from the professor. At the same time, each of them lets the same amount of a smelly gas into the room. One of them releases ammonia, NH3, and the other releases SO2. NH3 has a pungent odor, and SO2 smells like rotten eggs. The professor has no idea that this has happened, until she smell the first gas. Which chemical will the professor smell first? (NH3 or SO2) . If the professor starts to smell the first gas 42. seconds after the gas is released, how long will it take her to smell the second gas? sec. * Note: It is unsafe practice to work with these chemicals in an open lab.An engine emits about 5lbs of Carbon atoms in the form of Carbon dioxoide molecules for every gallon of gas it consumes. The average American car is driven about 12,000 miles per year. Using this information, check the statement that the average American car releases its own weight in carbon into the atmosphere each year. What are some assumptions that you can make to solve this problem? For every 5lb of the car's weight = 1 gallon of gas the average weight of a car = 4000lbs the average miles per gallon = 23.6 With this information, you can use conversions to determine how many gallons of gas that car requires to go 12000 miles.fF 7a.
- 4. Two students, Imani and Josiah, are discussing their results: Predicted volume: 75.7 ml Measured volume: 71.9 ml Imani says: (1) I think the gas is warmer than 23°C after the reaction. This means our conversion factor of 24 L is too low. There are more than 24 liters for every mole. Josiah says: (2) I think there is friction in the piston in the gas collection tube, which prevents it from moving all the way out. Which explanation matches their results? (Enter 1 or 2. Enter 3 if neither explanation is consistent with the results.)The U.S. proven natural gas reserves in 2013 were 323 trillion ft3 . How long will these reserves last if there are no imports or exports and if the U.S. annual rate of use of 24.5 trillion ft3 continues?A certain half-reaction has a standard reduction potential E =-1.25 V. An engineer proposes using this half-reaction at the cathode of a galvanic cell that must provide at least 0.80 V of electrical power. The cell will operate under standard conditions. Note for advanced students: assume the engineer requires this half-reaction to happen at the cathode of the cell. h Data Ag+ (aq) + e Ag (s) 0.7996 Is there a minimum standard reduction potential that the half-reaction used at the anode of this cell can have? yes, there is a minimum. Ered = v !! Al3+ (aq) + 3e-- Al (s) -1.676 Au+ (aq) + e Au (s) 1.692 If so, check the "yes" box and calculate the minimum. Round your answer to 2 decimal places. If there is no lower limit, check the "no" box. Au3+ (aq) + 3e - Au (s) 1.498 O no minimum Ba2+ (ag) + 2e - Ba (s) -2.912 Brz (1) + 2e- 2Br (aq) 1.066 Ca2+ (ag) + 2e - Ca (s) -2.868 Is there a maximum standard reduction potential that the half-reaction used at the anode of this cell can have? E=…
