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Suppose CoQ (also known as ubiquinone) is reduced to CoQH2 by one of the iron-sulfur proteins, Fe-S(Fe2+), with a standard reduction potential Eo'= - 0.270 V at 37.0 oC. (Assume all values tabulated for 25 oC are unchanged at 37.0 oC; answer all questions below using this temperature.) (a) Write the relevant half-reactions and from these derive the balanced redox equation for the above reaction. (b) Calculate ?Eo'. (c) Calculate ?G o'. (d) Calculate the equilibrium constant, K. (e) Which side of the reaction (reactants or products or neither) is favored structurally? (f) Calculate the pH of the system that will generate a cell potential, ?E, of + 0.157 V when the ratio [Fe-S(Fe2+)]/[Fe-S(Fe3+)] = 2.25, [CoQ] = 8.17 x 10-4M, and [CoQH2] = 7.59 x 10-3M.
At 1.00 atm and 23 C, how many liters of carbon dioxide are formed by the combustion of 3.40g of butane?
For the reaction A --> B, the activation energy is Ea = 125 kJ/mol and the heat of reaction, H = 50 kJ/mol. What is Ea for the reverse reaction in kJ/mol?
What is the value of q when 0.0209 g of water vaporizes at 373 K? The enthalpy of condensation of water at 373 K is -40.7 kJ/mol.
Calculate the equilibrium concentrations of NH3 and H2S if a sample of solid NH4HS is placed in a closed vessel and decomposes until equilibrium is reached
Propane gas (C3H8) is used as a fuel in rural areas. How many liters of C02are formed at STP by the complete combustion of the propane in a container with a volume of 15.0 L
The activation energy for the following reaction is 60. kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+ By what factor (how many times) will the rate constant increase.
Calculate the volume in milliliters of a 0.30 M acetic acid solution that contains 0.0142 mol HC2H3O2.
Determine the root-mean-square speed of CO2 molecules that have an average kinetic energy of 4.21*10^(-21) J per molecule.
5.00 ml of a water sample was titrated for hardness with 4.15mL of 0.0200M EDTA. Write an equation for the reaction and calculate the hardness of the water in ppm
A chemical reaction in which the atoms of the reactants undergo a change in the oxidation state is called a redox reaction. Such involve both oxidation (increase in oxidation state) and reduction
How much heat energy, is needed to convert 64.0 grams of ice at -18.0 degrees celcius to H2O at the temperature of 25.0 degrees celcius? Express your answers in kilojoules
You transfer a sample of a gas at 17*C from a volume of 5.67L and 1.10atm to a container at 37*C that has a pressure of 1.10atm. what is the new volume of the gas?
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