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A certain reaction has an enthalpy of H = 49 kJ and an activation energy of Ea = 71 kJ. Explain what is the activation energy of the reverse reaction?
You have 25 ml of 0.5 M standard NaOH solution (density 1.03 g/ml at 20oC) and copious quantitiesof distilled water. Explain how you would prepare a 10^-3 molal solution; density of water at 20oC is0.9982 g/ml
A liquid unknown was found to be insoluble in water and soluble in cyclohexne and alcohol, the unknown was found to have a boiling point of 145oC at 658 mmHg . Explain what is the substance? Explain what could you do to confirm your answer?
Place the following gases in order of increasing average molecular speed at 300. K: CO, SF6, H2S, Cl2, HBr. (Use the appropriate symbol to separate substances in the list.) chemPadHelp SF6
Suppose you wished to control the PO43- concentration in a solution of phosphoric acid by controlling the pH of the solution. If you assume you know the H3PO4 concentration, what combined equation would be useful for that purpose? Include physical..
A sample of Oxygen is collected in a 206 mL container over water at 15C, and the barometer reads 793 torr. What volume would the dry gas occupy at 704 torr and 15C? Water's partial pressure at 15C is 12.8 torr. Answer in units of mL.
Estimate the final temperature of the gas if 58g of air at 25 degrees Celsius and 50 bar undergoes a Joule-Thomson throttling to a final pressure of 1 bar. Assume the Joule-Thomson coefficient is independent of temperarture and pressure.
H2O2 serves as an oxidizing agent or as a reducing agent. write equations for the reactions involved. what is the major difference between the conditions of the two reactions.
Determine the molarity of each of the following. be sure to show the setups by which you get the answers. Na+ and SO3(2-) in .647 M Na2SO3 Ca2+ and SO4 (2-) in .035 M CaSO4
It is found that 4.68e-06 g of Nd2(CO3)3 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Nd2(CO3)3
Calculate the concentration of H3O+, OH-, NH4+, and NH4+, and NH3 in 1.00 x 10-6 M NH4Cl solution. Kw = 1.00 x 10-14 and K = 5.52 x 10-10 for NH4+ H2O ?=? NH3 + H3O+.
The equilibrium constant for the reaction lower @ 986 degree C is 0.63. A mixture of 1.0 mole of H20 vapor and 3.0 moles of CO is permitted to come to equilibrium at a total pressure of 2.0atm
a certain compound has a half-life of 14 minutes at 25c. its decomposition is a first order process. how much time does
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