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Problem 4 An inorganic chemist who studies the reactions of phosphorus halides mixes 0.105 mol of PCl5 with 0.045 mol of Cl2 and 0.045 mol of PCl3 in a 500-mL flask at 250oC . The reaction equation is PCl5(g) ?? PCl3(g) + Cl2(g) The equilibrium constant for the reaction Kc = 4.2 x 10-2 a) What is the direction of the reaction? Why? Show your calculations! b) At equilibrium the concentration for PCl5, [PCl5]eq = 0.1675 mol/L. Calculate [PCl3]eq and [Cl2]eq c) Calculate Kp for this reaction at 250oC. Problem 6 How does a decrease in temperature affect the partial pressure of the underlined substance and the value for Keq for each of the following reactions? Explain your answer! a) C(graphite) + 2H2(g) ?? CH4(g) ΔH0 = -75 kJ b) N2(g) + O2(g) ?? 2NO(g) ΔH0 = 181 kJ c) P4(s) + 10Cl2(g) ?? 4PCl5(g) ΔH0 = -1528 kJ Problem 7 Consider the following equilibrium reaction: PCl5(g) ?? PCl3(g) + Cl2(g) ΔH0 = 92.5 kJ/mol kJ Predict the effect on the equilibrium position of the following changes a) the temperature is increased b) chlorine gas is added to the mixture c) a catalyst is added
A cube of a silver-colored metal with a volume of 64 cm3 has a mass of 672 g. The density of pure silver is 10.5 g/cm3. Is the metal pure silver?
Determine value for the rate of formation of HCl during the same interval of 3 seconds If the rate of disappearance H2 = -0.13 M/s at this specific time?
To determine the freezing points of distilled water, 1m glucose, 1m NaCl, 1m CaCl2. Use the freezing point of the pure water as a baseline to determine deltaTf for each of the solutions
The next 6 questions involve the calculation of concentrations of the molecular and ionic species in an aqueous solution that has an analytical composition of 0.260 M KH2PO4 + 0.160 M K2HPO4.
what will be the final temperature of the solution in the calorimeter? The heat of solution,delta H solution, ofCaCl2of is -82.8kj/mole.
A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) ? 2 NH3(g)
Write the structures of the organic products that will be formed when methyl benzoate is treated with lithium aluminum hydride and the reaction mixture is worked up with aqueous acid.
a nugget of gold with a mass of 521g is added to 50.0ml of water. the water level rises to a volume of 77.0ml. what is
A buffer solution contains 0.23 mol of carbonic acid (H2CO3) and 0.55 mol of sodium hydrogen carbonate (NaHCO3) in 2.10 L. The Ka of carbonic acid (H2CO3) is Ka = 4.3e-07. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer af..
An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 12.4°.
which is the lowest at 25 C a) deltaG f for H2O(s) b) deltaG f for H2O(l) c) deltaG f for H2O(g) d) 1/2 deltaG f for O2(g) plus deltaG f for H2O(g)
A 0.2527-g sample of a mixture of Mg(OH)2 and Al(OH)3 was treated with 50.00 mL of 0.225 mol L?1 HCl(aq). The resulting solution required 13.73 mL of 0.176 mol L?1 NaOH(aq) to neutralize the excess, unreacted HCl
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