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Someday, cars may be powered by clean H2/O2 fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), what pressure of H2 would be required to develop 1.278 volts from the cell at 25 C?
at constant pressure the temperature of a 8.00 liter sample of gas is decreased from 456 K to 365 K. What is the new volume of the gas sample?
How many hours are required for 0.100 mol of electrons to flow through a circuit if the current is 1.00 A
Consider a molecule having three energy levels as follows: State Energy (cm?1) degeneracy 1 0 1 2 500. 3 3 1500. 5 Imagine a collection of N molecules
Iron metal is coated wih nickel. Which of metals will undergo corrosion when coating is damaged? Give the scheme of electrochemical corrosion and write equations for the reactions
What must be the initial concentration of reaction, [A]0, if (a) the zero- and first-order; (b) the zero- and second-order; (c) the first- and second-order reactions are to have the same half-life?
would the percent of KClO3 (sample 1:64.287% , sample 2:71.68%) be too large or too small if the system was not permitted to cool before the pressures were equalized
if the the atmospheric pressure is 685 mm Hg, what would the partial pressure of oxygen and of nitrogen be?
Given a solution containing 0.01M of lead chloride and 0.01M of lead chromate, calculate the concentration of Pb2+. Using the Ksp(PbCl2)=1.7x10^-5 and Ksp(PbCrO4)=1.77x10^-14. What is the solid remaining?
A gas expands and does P-V work on the surroundings equal to 325 J. At the same time, it absorbs 161 J of heat from the surroundings. Calculate the change in energy of the gas.
Explain why bubbles are observed to emerge from the jar when it is in the boiling water. b. Explain why the lid "pops down" on the jar top soon after removing the jar from the boiling water.
Instead of 6 M NaOH being added to the test solution, 6 M HCl is added. How will this affect the test for the presence of ammonium ion in the solution? Explain.
If you measure the pH and find it to be 11.24, how many grams of triethylmine were used to make the solution?
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