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Free Energy of Reaction -- Temperature Dependence
2NH3(g) + 3O2(g) + 2CH4(g) 1000°C --------> Pt - Rh 2HCN(g) + 6H2O(g)
The above reaction is used in the industrial production of hydrogen cyanide. Consider the relevant thermodynamic data from the appendices of your text. (The tabulated values ΔH°f and S° are for 25°C. For the purposes of this question assume that ΔH° and ΔS° are invariant with temperature. This is not actually true but would generally be a reasonable approximation over "small" temperature ranges.)
a) Calculate ΔH° for this equation.
-939.8 kJ
b) Calculate ΔS° for this equation.
165 J/K
c) Calculate ΔG° at 787°C, for this equation.
What are the initial and final pH's? What would be the pH if the same amount of HCl were added to the 125 mL of pure water? The Ka of acetic acid is 1.8*10^-5
Balloons are still used to deploy sensors that monitor meteorological phenomena and the chemistry of the atmosphere. It is possible to investigate some of the technicalities of ballooning by using the perfect gas law
an amount of sucrose a nonelectrolyte 342.30 gmol is dissolvedin 233.0 grams of water that increases the boiling point
Kb has the value of 1.4 x 10-4. What pH would you expect for 0.035 M solution of ephedrine, assuming that no other substances are present?
reaction takes place in acidic solution, \rm H_2O{(l)} and \rm H^+{(aq)} will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation
A microwave oven operates at 3.00GHz . What is the wavelength of the radiation produced by this appliance? Express the wavelength numerically in nanometers.
Under what circumstances is the Nernst equation applicable? What is the numerical value of the reaction quotient, Q, under standard conditions?
A compound containing only C, H, and O, was extracted from the bark of the sassafras tree. the combustion of 88.5 mg produced 241 mg of CO2 and 49.2 mg of H2O. the molar mass of the compound was 162 g/mol.
Will B-myrcene and allo-ocimene structures not form Diels-alder adducts with maleic anhydride? explain why in each case.
Problem- A 1.00*10^3 mL sample of 1.50 M HCl solution is treated with 4.95 g of magnesium. Calculate the concentration of the acid solution after all the metal has reacted. Assume that the volume remains unchanged.
Experiments have shown that the average frequency of chirping by a snowy tree cricket depends on temperature as shown below
determinenbsp the pressure in atm inside the can if a metal can of 1.00 qt contains 0.150 grams of helium at a
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