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Solar energy has been suggested as a source of renewable energy. If, in the desert direct radiation from the sun (save for 320 days) is 975 W per m2 between 10 AM and 3 PM, and the conversion efficiency to electricity is 21%, how many square meters are needed to collect an amount of energy equal to annual US energy consumption of 100 quadrillion BTUs? Is this construction feasible? How many pounds of coal (of heating value of 10,000 BTUs per pound) would be needed to provide the 100 quadrillion BTUs if the efficiency of conversion to electricity was 35%? What fraction of the US coal reserves (estimated at 250 billion short tons) is the calculated quantity?
A 2.154-g sample of HgO produces 125 mL of oxygen collected over water at 24 degrees C and an atmospheric pressure of 763 mm Hg. Calculate the STP molar volume for oxygen.
Suppose that 35.47 g of ice at -13.7°C is placed in 46.51 g of water at 96.7°C in a perfectly insulated vessel. Calculate the final temperature.
If you start with 6.00 moles of C3H8 (propane) and 6.00 moles of O2, how many moles of carbon dioxide can be produced. C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g)
If the equilibrium concentration of Fe3+, SCN-, and FeSCN2+ are 0.00140 M, 0.00140 M, and 0.000414 M, respectively, calculate the equilibrium constant for Fe3+ + SCN- FeSCN2+.
The Ka of a monoprotic weak acid is 6.08 × 10-3. What is the percent ionization of a 0.187 M solution of this acid
A student added a total of 15.00 mL of 0.5241 M HCl to 1.4881 g to of an unknown which contained CaCO3 (molar mass = 100.09 g/mol). The resulting solution required 12.21 mL of 0.1211 M NaOH to back titrate the excess HCl. What was the percent CaCO..
spontaneous chemical reactions produce products which are more energetically stable than the reactants which form them. A strong acid reacts with a strong base to produce water and the free ions of a salt.
identify a chemical reagent used in this experiment that can be used to distinguish cacl2 (soluble) from CaCo3 (insoluble)
A 2.0 L container is charged with a mixture of 6.0 moles of CO(g) and 6.0 moles of H2O(g) and the following reaction takes place: CO(g) + H2O(g) CO2(g) + H2(g) When equilibrium is reached the [CO2] = 2.4 M. What is the value of Kc for the reacti..
A reaction yields a colored product and the absorbance at a given wavelength increases at 0.2 per minute. The molar absorbtivity of the product is 4.0 ?M-1cm-1. What is the rate of product formation. Use correct units.
A 0.7549g sample of a pure hydrocarbon burns in oxygen gas to produce 1.9061g of carbon dioxide and 0.3370g of water.
How much heat is required to convert 47 g of ethanol at 36 degrees Celsius to vapor phase at 78 degrees Celsius?
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