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Using the following spectral information, determine the name of unknown organic compound A. For full credit, explain why/how the spectral information led you to your answer.
Mass spectrometer: Molecular ion of 148 m/z
IR: strong absorption between 2800 and 3000 cm-1, strong absorption at 3050 cm-1, and strong absorption between 1400 and 1600 cm-1
NMR: singlet at 2.5 delta units with integration of 3, singlet at 2.0 delta units with integration 9, 2 sets of doublets between 7.0 and 8.0 delta units with integration of 2 each
Which statement best desrcibes the energy change as bonds are formed and broken in this reaction ?
element z has two isotopes: one has mass number of 19.0 amu is 55.0% abundant,and the isotope with mass number 21.0 amu is 45.0% abundant. what is the average atomic mass for element Z?
The reaction A=B+ C is second order in A. when [A}0=0.100M, the reaction is 20% complete in 35 minutes. Calculate the value of the rate constant in ( L/min.mol)
how many moles of magnesium oxide are produces by the reaction of 3.82g of magnesium nitride with 7.73g of water? how many grams of excess reactant is left over?
Consider the titration of a 22.0 -mL sample of 0.110 M HC2H3O2 with 0.130 M NaOH. Determine each of the following. A. The initial pH B. the volume of added base required to reach the equivalence point in mL
Why does the electron energy threshold of dissociation almost always exceeds the actual dissociation energy in contrast to dissociation, stimulated by vibrational excitation
flask apparatus, which now contains 2.00 L H2 at a pressure of 360 torr and 1.00 L N2 at an unknown pressure. if the total pressure in the flasks is 320 torr after the stopcock is opened, determine the initial pressure of N2 in the 1.00-L flask.
A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2O(g). This reaction has the advantage that neither product is toxic, so no dangerous pollution is released
calculate the percentage of empty space in 1 mol of water at 25C. Obtain the density from the experiment " Some Measurements of Mass and Volume." The volume of a molecule of water can be taken as the sum of the volumes of the two hydrogen atoms.
The burning of sufficient magnesium in oxygen to form 2.00 grams of magnesium oxide results in the liberation of 30.1 kj.
Which of the following is/are an atom, an isotope and an ion?
in a laboratory, 6.82 g of Sr(NO3)2 is dissolved in enough water to form 0.500 L of solution. A0.100-L sample is 0.0245 M solution of Na2CrO4.
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