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Provide a structure for the following compound: EI mass spectrum: two molecular ions of about equal intensity at m/z = 180 and 182; IR: 1740 cm-1; 1H NMR: ? 1.30 (3H, t J = 7 Hz); ? 1.80 (3H, d, J = 7 Hz); ? 4.23 (2H, q, J = 7 Hz); ? 4.37 (1H, q, J = 7 Hz).
A chemist prepares a solution by dissolving 4.168 g of NaNO3 in enough water to make 200 mL of solution. What molar concentration of sodium nitrate should appear on the label.
Consider the titration of 100.0 ml of .100M H2NNH2 by .200 M HNO3. Calculate the pH when the following volumes of HNO3 have been added
Given the Rydberg constant of -2.18x10^-18 J, Calculate the wavelength of the emitted photon for the first transition (highest energy) in each series.
what would be the effect on this experiment if the student Aceton +benzaldehyde ----> dibenzalacetone a. added half the amount of benzaldehyde?
Calculate the pH of a buffer made with 0.50 M phosphoric acid and 0.75 M sodium dihydrogen phosphate. Ka = 7.5 x 10^-3
How would you prepare 3-methylheptane from either, butane, 1-bromobutane, or 2-bromobutane?
The molar absorptivities for methyl red in its acid form are 44640 M^-1cm^-1 @ 524 nm and 3860 M^-1cm^-1 @ 425nm and for methyl red in its base form are 740 M^-1cm^-1 @ 524nm and 18530 M^-1cm^-1 @ 425nm
Describe a common buffer system and elution method in ion exchange chromatography. What are the salt ions in the elution buffer good for
A student has analyzed several 1 nL volume samples of a 10-12 M solution. What is the expected precision due to Poisson statistics
A 2.41-L container is filled with 189 g argon. If the pressure is 10.0 atm, what is the temperature?
What is the product of the reaction. It always seems to lose format after I post. The the CH3 is attached to the last CH. and CH3I (excess) is suppose to be above the arrow.
What does the angular momentum quantum number determine. Check all that apply. A.) the overall size of an orbital B.) the energy of the electron on the outer shell
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