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What are the concentrations of all species and the pH of a buffer solution that is 0.30M NH3 and 0.3 0M NH4Br? For NH3 Kb = 1.8 X 10-5. If 20.0 ml of 0.20 M HBr is added to 100 mL of the above buffer what is the pH of the resultant solution and by how much does the pH change?
Consider the reaction that occurs when a solution containing hydrochloric acid (HCl) is added to a solution containing the weak base methylamine (CH3NH2).
Properties of Electrolyte Solutions, In the winter of 1994, record low temperatures were registered throughout the United States. For example, in Champaign, Illinois, a record low of -29 F was registered.
A solution containing Pt4+ is electrolyzed with a current of 4.20 A. How long will it take to plate out 65% of the platinum in 0.50 L of a 0.010 M solution of Pt4+
A gas mixture contains helium and oxygen at respective partial pressures of 255 torr and 0.450 atm. What is the total pressure in mm Hg of the mixture?
the final product was dibenzalacetone. Calculate the theoretical yield of this reaction.
A nitric acid solution containing 71.0% HN)3 (by mass) has a density of 1.42 g/mL. How many moles of HNO3 are present in 1.00L of this solution?
a sample of helium gas initially at 37 degrees celsius, 785 torr and 2.00L was heated to 58.0 degrees celcius while the volume expanded to 3.24L. What is the final pressure in atm.
An oxygen molecule is adsorbed onto a small patch of the surface of a catalyst. It's known that the molecule is adsorbed on 1 of 36 possible sites for adsorption
At equilibrium the total pressure was 1.00 atm and the NOCl prssure was 0.27 atm. 2NOCl(g) &hArr 2NO(g) + Cl2(g) Calculate the partial pressure of NO and Cl2 in the system
Cyanogen is a gas which contains 46.2 % C and 53.8 % N by mass. At a temperature of 25oC and a pressure of 750 mmHg, 1.50 g of cyanogen occupies 0.714 L.
A star is estimated to have a mass of 1 1036 kg. Assuming it to be a sphere of average radius 7.0 105 km, calculate the average density of the star in units of grams per cubic centimeter.
If 45 mL of H2 (g) are collected over water at 27°C and 751 mmHg external pressure. How many grams of Al were reacted.
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