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The 13C nucleus is a spin 1/2 particle, which means it can orient in two directions in a magnetic field (with the field and against it). The difference in energy between the two orientations is given by:
dE = (0.705 x 10-26 J T-1)B
where B is the magnetic field strength in Tesla. In an NMR spectrometer with a 1.45 T field strength, what is the ratio of the population of nuclei oriented opposite the magnetic field with respect to those oriented with the magnetic field at 25 °C?
throat lozenges was dissolved in enough water to make 10.0 mL of solution at 25 degrees C. The osmotic pressure of the resulting solution was 4.95 atm. Calculate the molar mass of the compound. Answer in g/mol.
A chemist wants to make 6.5 L of a 0.270 M solution. What mass in grams should the chemist use?
As a bromine molecule approaches perpendicular to the negatively charged pi cloud of the carbon-carbon double bond, its bonding electrons are repelled away from the bromine atom nearer the double bond
Calculate [OH] for a solution formed by adding 5.00 mL of 0.140M KOH to 15.0 mL of 9.0×10-2M Ca(OH)2.
CO2 Dissociation by means of electronic excitation. Using Fig. 5-6, calculate the decrease in energy thresh- old of the CO2 dissociation through electronic excitation related to preliminary vibrational excitation
If a 180 piece of gold (density =19.32 ) is hammered into a sheet measuring 2.51.0 , what is the average thickness of the sheet in meters?
at 75 degrees celsius, a gas has a volume of 3.22 dm^2. What volume will it occupy at 75 k?
The final temperature of the water in the calorimeter was 24.2 deg C. What is the heat capacity of the calorimeter?
Which one of the following is a redox reaction?
The temperature dependence of the reaction rate constant is given by the equation: ... ln k = ln A - Ea/RT ... ... Where: k = rate constant T = temperature A
we place an excess ( more than can dissolve) of PbCl2 into 100 ml. of water and find that at equilibrium [Cl]=0.032 M . Calculate kc for the following reaction : PbCl2 = Pb+2Cl
Calculate the thickness of a salt layer left after evaporating an ocean of 35%u2030 salinity and 4-km depth.
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