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Problem- A 5.00 mL ampule of a 0.100 M solution of naphtalene in hexane is excited with a flash of light. The napthalene emits 15.5 J at an average of 349nm. What percentage of the naphthalene molecules emitted a photon?
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solutions of HCl and NaOH and must determine their concentrations. You use 33.6 mL of NaOH to titrate 100. mL of HCl and 24.0 mL of NaOH to titrate 50.0 mL of 0.0838 M H2SO4. Find the unknown concentrations.
A gas sample containing 1.65 mol at 25°C exerts a pressure of 413 torr. Some gas is added to the same container, and the temperature is increased to 50.°C.
Classify the solid state of the subsequent substances as ionic crystals, covalent crystals, molecular crystals or metallic crystals. (a) CO2, (b) B12, (c) S8, (d) KBr, (e) Mg, (f) SiO2, (g) LiCl, (h) Cr
Describe how a phospholipid differs from other fatty acids. How does this difference allow the formation of a bilayer in an aqueous medium
The flask was then shaken until the solution was uniform. A 20.0-rm mL sample of this glucose solution was diluted to 0.500 rm L. How many grams of glucose are in 100. rm mL of the final solution?
The reaction X(s) ? X(g) is known at 25oC to have standard enthalpy, free energy, and entropy changes of 146.8 kJ, kJ, and 175.4 J/K. At what temperature (oC) does X(s) sublime?
Draw a heating curve (qualitative) starting with ice at -20 degrees C going to steam at 200 degrees C. Indicate the solid, liquid, and gas states, and the melting and boiling points.
Due to oxygen consumption by the above reaction, the dissolved oxygen concentration in the water is only 2 mg/L. What is the maximum amount of energy that an organism could obtain by oxidizing 1 µmol of the organic matter
For a particle in two-dimensional 1 box L1 = L2 = L tabulate the energy values in the lowest 4 energy levels (as multiples of E where E = H2 /8mL2) as well as degeneracy of each level.
Compute the molar mass of the noble gas krypton(Kr) in a natural sample, which is 2.2% 80 Kr (molar mass 79.91 g/mol),
Write the balanced neutralization reaction between H2SO4 and KOH in aqueous solution. .150 L of .430 M H2SO4 is mixed with 0.100 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization
A student collected hydrogen in a eudiometer as described above. Barometric pressure is 765.5 Torr, the vapor pressure of water is 22.0 Torr at this temperature and the solution remaining in the eudiometer is 5.75 cm above the water in the beaker
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