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Molten carbonate fuel cells fueled with H2 convert as much as 60% of the free energy released by the formation of water from H2 and O2 into electrical energy. Determine the quantity of electrical energy obtained from converting 1 mole of H2 into H20 (liquid) in such a fuel cell.
A chemist wants to make 4.5L of a 0.340M CaCl2 solution.What mass of CaCl2 (in g ) should the chemist use?
The molality of sodium nitrate solution us 1.44m. What is mole fraction of NaNo3. The molar mass of NaNo3 is 85.06g/mol
What is the rate constant of a first-order reaction that takes 375 for the reactant concentration to drop to half of its initial value?
Impure benzoic acid was dissolved in hot water. the container of solution was placed in ice-water bath instead of being allowed to cool slowly.
The precipitate was filtered, dried, and weighed. A total of 2.10 g calcium fluoride was collected. What was the percentage of CsF in the original sample?
A metal object with a mass of 19 g is heated to 96 degree celcious, then transferred to a calorimeter containing 75 g of water at 18 degree celcious
what is the change in pH after addition of 10.0mL of 1.0M sodium hydroxide to 90.0mL oof a 1.0M NH3/1.0M NH4+ buffer? (Kb for ammonia is 1.8 X 10-5)
A sample of nitrogen gas, N2 is collecyed in a 100 mL container at a pressure of 688 mm Hg and a temperature of 565 degress celsius. How many grams of nitrogen gas are present in this sample.
If Hg and 1.50g O2 are obtained from heating 56.0g HgO, what is the masspercent yield of O2 ? Hint work out the stoichiometry of the reaction first.
What mass of melamine will be obtained from 168 kg of urea if the yield of the overall reaction is 79.0%
If you titrate 1.0 g of H2O2 solution (30wt%) with KMnO4, 25.05 ml of this KMnO4 solution is used. What is the molarity of KMnO4?
Find out the Kb of ammonia if the pH of a buffer formed by mixing 50.0 mL of 1.00 M NH 3 and 50.0 mL of 1.00 M ammonium nitrate?
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