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A new technique has been developed for which molecules can be selectively ionized by multi-photon excitation using laser induced excitation (e.g., two photons are sequentially absorbed to give the excited state). Experimentally it was observed that naphthalene could be selectively ionized by sequentially absorbing three photons at a wavelength of 363.24 nm. What was the experimental ionization energy for naphthalene in kJ/mole?
A titration was performed with a solution of 10.00 mL of Ca(OH)2 and 25.00mL of DI water. The endpoint was reached with a 0.03192 M of HCl at a final volume of 11.25 mL.
If 0.140mol of a nonvolatile nonelectrolyte are dissolved in 3.30mol of water, what is the vapor pressure PH2O of the resulting solution? The vapor pressure of pure water is 23.8 torr at 25 °C
Given a stock solution of a food dye having a concentration of 1.0 x 10-5 and an absorbance of 0.700. If a new solution is made by diluting exactly 10.0 mL of the solution with exactly 20.5 mL of distilled water, what should the absorbance of the ..
20.00mL of .120M Cu+ is titrated with .100M Ce4+. What is the voltage of the cell when the amount of added Ce4+ is (a)5.00mL, (b) 12.00mL, (c) 22.00 mL
2Al(s) + 6HCl(aq) 2AlCl3(aq) + 3H2(g) According to the equation above, how many grams of aluminum are needed to completely react with 3.93 mol of hydrochloric acid
The molar mass of a neutron is 1.008665 g/mol. Calculate the binding energy (in J/mol) of F-19. (c=2.998 x 10^8 m/s)
A 0.7995 g sample of a compound containing only uranium and chloride is dissolved in water and excess aqueous silver nitrate is added to precipitate 0.9982 g of silver chloride . Calculate the empirical formula of the compound.
A 6.11g sample of Cu-?Zn alloy reacts with excess aqueous HCl producing 1.26 L of H2(g) at 22.0 ?C and 728 torr. Since only the Zn portion of the alloy reacts, calculate the percent Cu in the alloy.
State whether you would expect the entropy change, delta S, to be positive, negative, or approximately zero for each of the following reactions: (a) A + B --> C (b) A + B --> C + D (c) A --> B + C Please explain.
A student is given a soluble sodium salt containing one of eight possible anions (negative ions): acetate, chloride, bromide, iodide, sulfide, sulfate, or phosphate. the student adds some BaCl2 solution to the salt solution.
A solution of a protein contains 0.382 grams of the material in 1.00 L of solution. At a temperature of 25°C,this solution has an osmotic pressure of 1.07 torr. Calculate the molar mass of the protein.
A Breathalyzer instrument contains two ampules, each of which contains 0.75 mg K2Cr2O7 dissolved in 3 mL of 9 mol L?1 H2SO4(aq). One of the ampules is used as reference. When a person exhales into the tube of the Breathalyzer, the breath is direct..
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