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If 85.0 of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m. ?
a sample of gas occupies 12 liters under a pressure of 1.2 atm. what would its volume if the pressure were increased to 2.4 atm? assume the the temperature of the gas does not change.
How many grams of CaH2 (Molar Mass = 42.1 g/mol)are needed to generate 10.0 L of H2 gas if the pressure of H2 is 769 torr at 28.0°C?
How many grams of methane must be combusted to heat 1.15 of water from 26.0 to 87.0, assuming as a product and 100% efficiency in heat transfer?
For caffeine, the partition coefficient between methylene chloride and water is approximately 8. If you add the following to a separatory funnel - 10 g caffeine,
Show that the balanced equation obeys the law of conservation of mass.
Have you observed that when you spill water over your skin on a hot day it will cool you down but if you spill vegetable oil in place of water it will not cool you down give explanation for this difference?
Write a suitable mechanism for the cleavage of butyl isopropyl ether with HI at 100 degrees Celsius to form exclusively isopropyl alcohol and 1-iodobutane.
construct an energy level diagram (molecular orbital) for the molecule SO. We are then asked to comment on the ionic species of SO - bond order, bond distance etc. So far so good.
A buffer solution was prepared by adding 4.95 g of sodium acetate, NaCH3CO2, to 2.50 x 10^2 mL of 0.150 M acetic acid, CH3CO2H. What is the pH of the buffer?
1.202 g of a solid white acid are dissolved in water and completely neutralized by the addition of 35.26 mL of 0.482 M NaOH. Calculate the molar mass of the acid, assuming it to be a monoprotic acid.
Consider the following equilibrium process at 686°C: CO2(g) + H2(g) ? CO(g) + H2O(g) The equilibrium concentrations of the reacting species.
A saturated solution of Ag2CrO4 prepared by dissolving solid Ag2CrO4 in water has [CrO4]= 6.5x10^-5M. Calculate Ksp for Ag2CrO4.
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