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Approximate the dose from gamma radiation to a prostate gland about 5cm in diameter arising from the implant of a Tc99m source at the center of the gland that has an initial count rate of 100,000 Bq. Tc99m has a 6 hour half life also decays via low energy IT and a 140 keV gamma ray.
A solution made by dissolving 28 mg of insulin in 5.5 mL of water has an osmotic pressure of 15.5 mmHg at 25C. Calculate the molar mass of insulin.
you prepare a buffer solution by dissolving 1.77 g each of benzoic acid hc7h5o2 and sodium benzoate nac7h5o2 in 900.0
The statements in the following multiple choices deal with various aspects of the relationship between vapor pressure and intermolecular forces. Choose the statement which is true.
could 131g of xenon gas in a vessel of volume 1.0dm^3 exerts a pressure of 20 atm at 25C if it behaves as a gas? if not what pressure would it exert? (b) what pressures would it exert if it behaved as a van der waals gas?
the electric potential energy associated with an electron and a proton is -4.35*10^-18 j. what is the distance between these two charges?
The direction I was headed with this is trying to calculate the molality with what I have here and I used a 1:1 ratio for the C2H6O2 and the water, but that gives me .06206 kg/mol. What is the boiling point of the radiator fluid
a carbon-hydrogen-nitrogen-oxygen compound has a molecularmass of 116.12 u. in a combustion analysis a 2.464 g sample
Consider a sealed flask with a moveable piston that contains 5.25L of O2 saturated water vapor at 25O C. The vapor pressre of water at this temperature is 23.76 mmHg. The piston is depressed at constatnt temperature so that the gas is compressed t..
A sample of gas (24.2 g) initially at 4.00 bar was compressed from 8.00 L to 2.00 L at constant temperature. After the compression, the gas pressure was ________ bar.
A sample of magnesium sulfate heptahydrate having a mass of 7.35 g. is dried completely. How many grams of dry product are expected to be found
Uranium hexafluoride is a solid at room temperature, but it boils at 56°C. Determine the density of uranium hexafluoride at 62°C at 755 torr.
what is the total molar concentration of all the ions in 0.030 M solutions of the following salts in water? a) 0.030 M KCl = ________ M ions b) 0.030 M CuSO4 = _____ M ions c) 0.030 M CaCl2 = _______ M ions
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