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# Exam1reviewAs - react at 850 degrees celsius according to...

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Hydrogen sulfide reacts with sulfur dioxide to give H2O and S, H2S + SO2 = H2O + S(solid), unbalanced. If 6.0 L of H2S gas at 750 torr produced 3.2 g of sulfur, calculate the temperature in C. Solution Balanced reaction: 2 H2S + SO2 = 2 H2O + 3 S(solid), 2 mol 3*32 = 96 g 2 mol H2S 3.2 g S ---------- = 0.067 mol H2S; 96 g S P = 750/760 = 0.987 atm PV 0.987 atm * 6 L T = --- = -------------------------------- n R 0.067 mol * 0.08205 atm L /(mol K) = 1085 K = 812°C

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A 10.73 g sample of PCl5 is placed in a 4.00 L flask at 200°C. a) What is the initial pressure of the flask before any reaction takes place? b) PCl5 dissociates according to the equation: PCl5(g) --> PCl3(g) + Cl2(g). If half of the total number of moles of PCl5(g) dissociates and the observed pressure is 1.25 atm, what is the partial pressure of Cl2(g)?
1 mole of oxygen gas and 2 moles of ammonia are placed in a container and allowed to

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Unformatted text preview: react at 850 degrees celsius according to the equation: 4NH3(g) + 52(g) -->4NO(g) + 6H2O(g) a. If the total pressure in the container is 5.00 atm, what are the partial pressures for the three gases remaining? b. Using Graham's Law, what is the ratio of the effusion rates of NH3(g) to O2(g)? Josh Shokorzadeh, the winter intern, has just broken the cooling system to the main helium tank. Josh tells you not to be worried; the tank can withstand up to 40.0 atm of pressure before exploding. Before Josh's accident, the tank was subjected to 10.0 atm. The tank was originally at 250 K, but it's a hot summer day, and you fear its temperature may rise to 350 K. Should you believe Josh? Because the values of V, n and R are constant while only P & T are changing. P 1 T 1 = P 2 T 2 plugging in the values from above we see the new pressure comes out to 14 atm. There is no worry but it should still be repaired....
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Exam1reviewAs - react at 850 degrees celsius according to...

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