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When a sample of phosphorus-32 was placed 1 cm from the detector, the intensity of its radiation was measured to be 491 counts per second. What would its activity be 2 cm from the detector
Three isotopes of silicon occur in nature: 28Si (92.21 %) which has a mass of 27.97693 amu; 29Si (4.70 %) which has a mass of 28.97659 amu; and 30Si (3.09 %) which has a mass of 29.97376 amu. Calculate the average atomic mass for silicon atom.
Calculate the final pressure of a gas if a 953-mL sample of the gas at 1.25 atm and 50.0 degrees Celsius is changed to 1.55 L at 75.0 degrees Celsius.Be sure to include units and correct significant figures
A compound contains only carbon and nitrogen and is 46.2% carbon by mass. A gaseous sample of the compound has a density of 2.05 g/L at 927 torr and 105 °C
Given the information below, what is the value of the unknown equilibrium constant?
Predict whether the entropy change is positive or negative for each of the following reactions. Give reasons for your predictions.
What mass of sucrose should be combined with 479 of water to make a solution with an osmotic pressure of 8.00 at 315 ? (Assume the density of the solution to be equal to the density of the solvent.)
FireFlies flash at a rate that depends on temperature. At 29 C the average rate is 3.3 flashes every 10 seconds;at 23 C the average rate falls to 2.7 flashes every 10 seconds.
Alcohols generally require acid catalyst in order to undergo substitution by nucleophiles. The acid catalyst enhances the reaction by
The original conditions on a container filled with gas at a constant temperature are 180 cc and 300 mm Hg. The desired new volume is 90 cc.
find the mass of barium metal(in grams) that must react with O_2 to produce enough barium oxide to prepare 1.0L of a 0.10M solution of OH^-
Evaluate the operating conditions of the chiller - what temperature must the chiller operate if the product streams are also at 1 atm total pressure?
Like many ATP-dependant enzymes, the ATP synthase can be "run in reverse" by providing the enzyme with ATP. If the ATP synthase was reversed while inside the mitochondrion, which of the following would occur?
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