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Radioactive isotopes often occur together in mixtures. Suppose a 190 sample contains , with a half-life of 12 days, and , with a half-life of 4.5 days.
If there are initially twice as many calcium atoms as there are barium atoms, what will be the ratio of calcium atoms to barium atoms 2.50 weeks later?
The activation energy of a certain reaction is 77.3 kj/mol. How many times faster will the reaction occur at 41 degrees celcius than at 0 degrees celcius?
Explain The pentose phosphate pathway is another possible direction for G-6-P. What are the two major products of the pentose phosphate pathway
Calculate the wavelength of light that would be required to excite an electron from the HOMO to the LUMO. Hint: Recall that (triangle)E=hv=hc/lambda, and that 1 eV=1.602 x 10^-19 Joules.
What is the enthalpy change for converting 1.00 mol of ice at -50.0°C to water at 70.0°C? The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K and 1.84 J/g-K respectively. For H2O, Hfus = 6.01 kJ/mol, and Hvap= 40.67 kJ/mol.
Determine how many milliliters of this solution should you dilute to make 100.0mL of 0.250M Ammonia(NH3)?
What is the pressure in psi for a pressure head of 46.2 feet? What is the pressure in psi for a pressure reading, in psi, at the bottom of a 30 feet high reservoir, which has a diameter of 50 feet?
Describe the experiment(s) (as necessary), observations (as necessary), and results (as necessary) which would allow you to distinguish
How many grams of SO2 would be formed from 60 grams of FeS2 in the following reaction
What is the expected Nernst equation, in mV, for each decade change in the hydrogen ion concentration for a glass elecrode
A feed mixture of ethanol and water is 40 mole % ethanol. The feed is at 200 degrees Celcius and is at a high enough pressure that it is liquid. It is input into the column through a valve, where is flashes. Column pressure is 1 kg/cm^2. Find the ..
closed container and the mixture is ignited the reaction products are CO2 and H2O. If 61.6 g of CO2 are actually produced in the reaction , what is the percent yeild of CO2?
how much acetone (CH3COCH3) would be needed to obtain 3.35 moles of acetone? the desnity of acetone is 0.851 g/mL.
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