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Explain why f-f transitions in the electronic spectra of lanthanide complexes are weaker than d-d transistions in the corresponding spectra of transistion metal complexes.
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A sealed vessel contains a gaseous mixture of H2 and excess O2. The mixture is at 500 K and has a total pressure of 140 kPa. After all of the hydrogen is reacted, the total pressure of the system measured at the same tem ...
The atomic masses of Lithium-6 (7.59%) and Lithium-7 (92.41%) are 6.0151 and 7.016 amu, respectively. Calculate the average atomic mass of chlorine. The percentages in parentheses denote the relative abundances.
A student weighed out 1.74 grams of sodium hydroxide pellets and added them to 48.0 grams of water in a calorimeter. Extrapolating back to the time of mixing yielded a temperature change at the time of mixing equal to 9. ...
A student finds that the mass of an object is 6.62 kg. She is told that her measurement has an error of 12.3%. What is the true mass (in kg) of the object?
A 41 kg person walking 5.6 km/hr requires 758 kJ of energy per hour. How much further does he have to walk to consume the addition energy contained i 320 g of ground beef relative to 320 g of broiled chicken? The energy ...
Consider reacting 100.00 mg magnesium with 20 mL of 1 M hydrochloric acid. Which reactant is limiting reagent? What is theoretical yield of hydrogen? express your answer in millimoles.
What are the benefits of measuring the absorbance at the maximum absorbance wavelength? If light has a wavelength of 756 nm, what is the wavelength in centimeters? What is the wavelength in inches?
Why does a hydrate exist only as a solid? What characteristic of a hydrate is responsible for this phenomenon?
Carbon-carbon single bonds in organic molecules have energies about350. kJ/mol. What is the corresponding wavelength? Could UV lamps(248 nm) be used to break these bonds?
The mass of a sample of CaCO3 is 751 grams How many total atoms are present in this sample?
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