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Iodine-131 is a radioactive isotope. After 2.00 days, 84.2% of a sample of 131I remains. Explain what is the half-life of 131I?
Upon combustion, a mole of hydrocarbon formed eight moles of CO2 and eight moles of H2O. Determine the molecular formula of the hydrocarbon and give the blanced combustion reaction.
The root-mean-square (rms) speed of a sample of molecules was found to be 1.8*10^3 m/s at 25.0 degrees C. After heating, the rms speed was found to be 4.6*10^3 m/s. What was the temperature of the sample after heating
a container is sealed at the top by a movable piston. inside is an ideal gas at 1.00 atm 20.0c and 1.00lawhat will
How many moles of carbon, hydrogen, & oxygen are present in a 100g sample of ascorbic acid? Ascorbic acid (vitamin C) contains 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. Assume a 100 g sample of ascorbic acid.
Predict whether a precipitation reaction will occur when aqueous solutions of ammonium sulfate and calcium acetate are mixed. Write the net ionic equation.
the rate of a first order reaction is 4.6 x 10 to the -4 power at 638k. if the activation energy is 104 kjmol calculate
The air in a laboratory was measured with a barometer to be 7.40 x 100 to the 2 power mm Hg. What is the laboratory air pressure in atm?
what is the formula for the dissolution of sodium propionate in
The metabolism of one mole of glycerol trioleate C51H93O6, a common fat , producess 3.022*10 Kj of heat. How many grams of the fat must be burned to raise the temperature of 50 g of water from 25 Cto 30 C
What is the minimum frequency of light necessary to emit electrons from sodium via the photoelectric effect What is the wavelength of this light
For a 5.0 gram sample of each of the following, what weight of water will be lost if the sample is heated to constant weight: CoCl?*9H?O; CuSO?*5H?O; ZnSO?*4H?O; BaCl?*2H?O.
To 250 mL of a 0.065 M solution of barium nitrate is added 100 mL of a 0.121 M solution of sulfuric acid. Determine the concentration of aqueous barium ions remaining in the solution after complete precipitation of barium sulfate.
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