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Standard reduction potentials for the Pb2+/Pb and Cd2+/Cd half-reactions are -0.13 and -0.40, respectively. At what relative concentrations of Pb2+ and Cd2+
Use the thermodynamic data in Appendix B to calculate the standard cell potential and the equilibrium constant at 25°C for the cell reaction in a direct methanol fuel cell
Constant temperature Calculate the work done (in joules) if thae gas expands against a constant pressure of 4.1 atm . Enter your answer in scientific notation
Calculate the pH of a buffer formed by mixing 60. mL of 0.13 M lactic acid with 86 mL of 0.26 M sodium lactate.
How many moles of sodium hypobromite (NaBrO) should be added to 1.00 L of 0.055 M hypobromous acid (HBrO) to form a buffer solution of pH 8.95? Assume that no volume change occurs when the NaBrO is
How many grams of Na2SO4 are there in 15 mL of 0.50 M Na2SO4? (b) How many milliliters of 0.50 M Na2SO4 solution are needed to provide 0.038 mol of this salt?
Calculate the molarity of a solution made by dissolving 5.00 g of glucose (C6H12O6) in sufficient water to form exactly 100 mL of solution.
Which of the following metals will be oxidized by Pb(NO3)2: Zn, Cu, Fe? Write the balanced molecular, ionic and net ionic equations for the reaction.
Write the balanced molecular, ionic and net ionic equations for the reaction between magnesium and cobalt(II) sulfate. (b) What is oxidized and what is reduced in the reaction?
A liquid begins to appear on the inside of a closed flask. At first glance before the liquid began to appear, you might have thought the flask was empty
Solubility constant for is 8.1E-12. When is in equilibirum with its ions in saturated solution. The concentration of silver ions.
A certain reaction has an activation energy of 70.0 kj/mol and a frequency of factor A1=7.80*10^12 M^-1 s^-1. what is the rate constant, k of this reaction at 24.0 degrees celcius.
The colors of the acid and base forms of the indicator bromocresol green are yellow and blue, respectively, and its pKa is 4.6. What color would be expected for the indicator in a solution of pH 6.0
determine the amount of heat (in kJ) given off when 1.42 * 10^4 g of NO2 is produced according to the following equation : 2 No(g) + o2(g) --> 2NO2(g) H = -114.6kj
Calculate the standard enthalpy of combustion. The standard enthalpy of formation of palmitic acid - 208kJ/mol
A buffer is created by combining 3.65 of with 4.72 of and diluting to a total volume of 700.0 . Determine the pH
Ultra-high-vacuum experiments are routinely performed at a total pressure of 1.0 x 10-10 torr. Calculate the binary number of collisions, Z11, of N2 molecules (per liter per second) at 350 K under t
Calculate the pH of a solution prepared by mixing 20mL of .20M NH3 with 40mL of .10M HNO3 (Kb for NH3= 1.8 x 10^-5)
An "empty" container is not really empty if it contains air. How may moles of nitrogen are in an "empty" two-liter cola bottle at atmospheric pressure and room temperature (25 C)? Assume ideal behav
Given the following heat capacities, (assume they are constant over the temperature range in consideration here), calcrulate enthalpy for the reaction 2NO + O2 ->2NO2 at 398k.
12.0 moles of gas are in a 3.00L tank at 22.7C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300L^2*a
Someone is forced to titrate a solution containing 100 mL of .250M sodium acetate with .125 M nitric acid. Calculate the pH of the solution after adding 50.0 mL of the nitric acid.
At 298, 1 atm, the heat produced by the reaction of 4.00mol of NO with molecular oxygen heats 1.07L liquid water from 298k to 348k. Calculate enthalpy for the reaction 2NO + O2 -> NO2, at 298k. A
A sample of Chlorine gas occupies a colume of 711 mL at pressure of 251 mmHg. Calculate the pressure of the gas (in mmHg) if the volume is reduced at constant temperature to 173 mL in scientific not