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What is the structure for an H NMR of C7H9NO giving signals of: 6.93, (0.93 H, triplet); 6.20 (1.03 H, doublet); 6.13 (1.01 H, doublet); 6.05 (1.03 H, singlet); 3.62 (3.00 H, singlet); 3.56 (3.01 H, singlet)?
oxygen are mixed according to the equation 2 H2 + O2 = 2 H2O, which is the limiting reagent
Draw the Newman projection and the corresponding potential energy diagram of "n-butane" conformers, rotating along C2-C3.
Find the total pressure for a mixture that contains four gases with partial pressures of 5.38 kPa, 4.52 kPa, 3.16 kPa, and 1.23 kPa.
The half life of pyruvic acid in the presence of an aminotransferase enzyme (which converts it to alanine) was found to be 221 s. How long will it take for the concentration of pyruvic acid to fall to 1/69 of its initial value in this first order ..
Why do sigma bonds have lower energy than pi bonds and are stronger if bond strength increases with bond energy?
calculate the quantity of heat produced when 19.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.
Oxalate ion, which can be abbreviated ox2-, is a ligand for Cu2+, forming the complex ion Cu(ox)22-. The formation constant for this ion is 3.0 x 108. The solubility of Cu(OH)2 is enhanced in the presence of oxalate
25.00 ml aliquots of thiis solution was titrated with monoprotic strong base NaOH (0.0800 M). The titre volume of NaOH was 40.00ml. Calculate the molecular weight of H2A.
What functional group is present in glucose? Is glucose a reducing or nonreducing carbohydrate?
calculate the ph that results when 100 mL a liquot of 0.0500 M is added to 400 M of a NH3/NH4+ buffer that is 0.200 M in NH3 and 0.300 M in NH4Cl
Write an equation for determining the average atomic mass number of an element that has two isotopes. Isotope 1 has a relative abundance of 33%, and isotope 2 has a relative abundance of 66%.
How much heat is needed to warm 250 g of water from 22 C to 98 C? The specific heat of water is 4.18 J/g . Be sure to include units but do not use scientific notation.
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