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The half-life of U238 is 4.5X10^9 years. How many disintegrations occur in 1 minute for a 10 mg sample of this element
a 5.00 gram sample of potassium chlorate/potassium chloride mixture was heated in a test tube. A total of 1.00 L of oxygen gas was collected over water at 25 degrees c and 741 torr. determine the percentage of potassium chlorate in the mixture.
What kinetic energy must the electrons have in order to resolve a protein molecule that is 3.80 nm in diameter? Take the mass of an electron to be 9.11× 10-31 kg.
Just completed the conversion of maleic acid to fumaric acid in the lab using Conc. hcl, heat and recrystallization. question: if the solubilities of the reactant and product were reversed( ie., if product were more soluble) how would one follow t..
What is the equilibrium constant for the reaction N2(g) + 3 H2(g) ?? 2 NH3(g) at this temperature?
a solution made by dissolving 5.00 g of a protein in 175 ml of solution has an osmotic pressure of 42.0 torr at 10
It phosphoresces at 500 nm. If the ratio of the transition probabilities for stimulated emission for the S* --> S to the T --> S transitions is 1.0 x 10^5, what is the half-life of the phosphorescent state
why are elements such as Hg, As, Bi, Sb and others first converted to their hydrides prior to sample analysis by Atomic Absorption Spectroscopy?
From the following data, calculate the delta G for the reaction at 25 degrees C. delta H = -199 kJ/mol delta S = -4.1 Joule/Kelvin - mol these are the Standard values of formation at 25 deg C.
To treat a thyroid tumor, a patient must be given a 170-mCi dose of iodine-131, supplied in a solution containing 41 mCi/mL. What volume of solution must be administered per dose?
when a gold nugget with a mass of 521 g is added to 50.0 ml of water the water level rises to 77 ml what is the density of gold
When equilibrium is reached at 700C, the total pressure of the system is found to be 4.00 atm. If the equilibrium constant Kp for this reaction is equal to 1.52,
12.0 moles of gas are in a 8.00 L tank at 23.2 C. Calculate the difference in pressure between methane and an ideal gas under these conditions.
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