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A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 → Pb-206 is 4.5 x 109yr. Assuming no Pb-206 was present in the rock initially, how old is the rock?
A 2.634g sample containing impure CuCl2 *2H2O was heated. The sample mass after heating to drive off the water was 2.125g. What was the mass percent of CuCl2 * 2H2O in the original sample?
Nitric oxide is made from the oxidation of ammonia. How many moles of nitric oxide can be made from the reaction
Problem- If 600j of heat energy are added to a system in energy state E1 and the system then does 450j of work on its surroundings, what is the energy change of the system. What is the energy change of the surroundings.
How many moles of NiCl can be formed in the reaction of 5.00 mol of Ni and 10.0 mol of HCl
What range of accelerating voltages would be required to cover the mass range between 16 and 625, for singly charged ions, if the field strength is held constant?
a nugget of pure gold of 4.80 grams is absorbed 284 joules of heat. if the initial temperature was twenty eight degree
A glass vessel fitted with an on/off value has a mass of 337.428g when evacuated. When filled with Ar, it has a mass of 339.712g. When evacuated and refilled with a mixture of Ne and Ar, under the same conditions of temperature and pressure
3-methyl-1butyne yields 2-methyl-2- butanol and 3-methyl-1-butanol by different mechanisms. In each case, a second alcohol would also be obtained. What alcohol would it be
If an automobile travels 230 mi with a gas mileage of 21.5 mi/gal, how many kilograms of CO2 are produced?
The equilibrium constant for the reaction H2(g) + I2(g) 2HI(g) is 62.5 at 800 K. What is the equilibrium concentration of I2 if at equilibrium [HI] = 0.22 M and [H2] = 0.10 M
Ocean water typically contains approximately 35 moles of salt ions dissolved in each 1000 moles of water. Assuming that ocean water has the same density as pure water, use this ratio to determine the molarity of the solution and then calculate ..
The alkali metal elements are found in _of periodic table
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