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The reaction OH(aq) + HCN(aq) H2O(l) + CN(aq) is first-order in both the OH and HCN concentrations. The rate constant at 25oC is 3.7×10^9 mol^-1 L s^-1. In an experiment, 0.500 L of 0.020 mol L ^-1 NaOH(aq) is rapidly mixed with an equal volume of 0.020 mol L^-1 HCN(aq). Calculate the time, in seconds, required for this [OH] to decrease to 1.0×10^4 mol L^1. (Hint: Start from the rate law in the form Rate = k [HCN ]^n[OH]^m
If 10 g of C react with 115 g of O2 according to the equation C + O2 → CO2, how many g of O2 will remain unreacted?
Calculate the standard enthalpy of the reaction, Delta(H) rxn}, for the thermite reaction: 2Al(s) + Fe2O3(s) ----> 2Fe(s) + Al2O3(s) Elements in their standard state have an enthalpy of formation value of zero
Ionization energy is the energy needed to eject an electron from an atom or ion. Calculate the ionization energy, IE
How many Carbon 14 atoms are in a charcoal sample that has a decay rate of 3500 disintegrations per min
What is the molarity of a solution prepared by dissolving 10.5 grams of NaF in enough water to produce 750 mL of solution?
N-Phenylmaleimide, can act as a dienophile in the Diels-Alder reaction Draw the structure of the product that would be formed by the treatment of N-phenylmaleimide with
Pyruvic acid, HC3H3O3, is involved in cell metabolism. It can be assayed for (that is, the amount of it determined) by using a yeast enzyme. The enzyme makes the following reaction go to completion.
Determining System Equilibrium, A one-litre cylinder at 458'C is found to contain 0.36 moles of HI (g), 0.15 moles of I 2(g), and 0.18 moles of H2(g). Is this system at equilibrium?
Determine the molar mass of each of the following gases: a) 2.90 g of a gas that occupies 0.500 L at 0 degrees C and 1.00 atm (STP); b) 1.43 g of gas that occupies 2.00 L at 0 degrees C and 760 mmHg (STP); c) 0.726 g of a gas that occupies 855 mL ..
In a seperate trial the student puts 214 mL of the same liquid into the same flask at the same conditions. What will the pressure measure (in kPa) in the second trial?
For the copper zinc cell the potential at 25 degrees C is 1.10 volts. The reaction is: Cu++ (aq) + Zn(s) = Zn ++ (aq) + Cu(s) Calculate the equilibrium constant for this reaction (a wire is connected and electrons flow between the electrodes)
suppose a 5.00 L sample of diatomic oxygen at a given temperature and preesure contains 1.08x10^23 molecules. How many molecules would be contained in 5.00L of hydrogen?
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