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a) Demonstrate that a chemical shift range of 8.0 ppm corresponds to a frequency range of 480 Hz on a 60 MHz instrument. Explain what is the frequency range on a 270 MHz instrument?
(b) Explain what magnetic field strength must be applied for C-13 spin transitions to occur at 90 MHz? magnetogyric ratio for C-13 = 6.728x107 rad.T-1.s-1
calcutate the molecular weight of surfur if 35.5 grams of sulfur dissolve in 100 grams of CS2 to produce a solution that has a boiling point of 49.48c.
Describe the reaction as endothermic or exothermic, and reversible or irreversible. B) A reaction has Horxn = 5.0 kJ/mol and a forward activation energy, Ea = 55 kJ/mol. What is the activation energy for the reverse reaction?
A reaction is carried out in a constant pressure calorimeter. Appropriate measurements are taken as well as the energy for the change is calculated. The amount of heat exchanged under these conditions leads to the computation of which state functi..
Combustion of 2.80 g of this compound produced 5.59 g of CO2 and 2.29 g of H2O. What is the empirical formula of the unknown compound?
Suppose that the atomic mass unit (amu) had been defined as one-twentieth of the average mass of an atom of lithium instead of one-twelfth of the mass of an atom of carbon-12. What would the average atomic mass of calcium be on this new scale
a 45.0 g aluminum block initally at 28.0 celsius absorbs 825 joules of heat. what is the final temperature of the
assume that the company had introduced lean production at the beginning of the second quarter resulting in zero ending
Calculate the molar Gibbs free energy change for the phosporylation of glucose by ATP to produce glucose-6-phosphate. Assuming the reaction happens at 310K and at pH 7. The concentration of ATP, ADP, G6P, and Glu are 1850 µM, 138 µM, 83 µM, and 50..
6.3 ml aliquot of 0.0529 m h2so4 aq is to be titrated with 0.0411 m naoh aq. what volume ml of naoh will it take to
the enthalpy of formation = 0? Something with standard states? But how do I know what the standard states are
If the pressure of a gas is 39.18 atm in a piston, what is the final pressure, in atm, if the volume of the piston is multiplied by 4 at a constant temperature?
Enough of a monoprotic acid is dissolved in water to produce a 0.0193 M solution. The pH of the resulting solution is 2.42. Calculate the Ka for
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