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Some watch dials are coated with a phosphor, like ZnS, and a polymer in which some of the 1H atoms have been replaced by 3H atoms, tritium. The phosphor emits light when struck by the beta particle from the tritium decay, causing the dials to glow in the dark. The half-life of tritium is 12.3 yr. If the light given off is assumed to be directly proportional to the amount of tritium, by how much will a dial be dimmed in a watch that is 50 years old?
An empty beaker has a mass of 38.112 g. 10.00 mL of ethyl alcohol are placed in thte beaker and the mass of the beaker with ethanol is found to be 45.268 g
If a balloon containing 1,200 L of gas at 25C and 760 mm Hg pressure ascends to an altitude where the pressure is 380 mm Hg and the temperature is 54C, the volume will be.
The volume of the CO2 gas was compute at 1 atmosphere pressure and 0 degrees Celsius (273 degrees K) to be a total of 896 mL of gas. Evaluate the percentage of barium carbonate in the mineral sample.
Calculate the equilibrium concentrationsfor this dissolution reaction if one mole of the solid is placed in 1.00 L of water (assume adding the solute does not change the volume of the solution
How many g of NaCl are required to prepare 250.0 mL of a 0.3440 M solution of NaCl in water?
What is the final pressure in the container if 705 mL of helium gas at 205 mm Hg is compressed to 255 mL?
Question- The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. But given the same kinetic energies, a lighter molecule will move faster than a heavier molecule.
The solubility-product constant for Ce(IO3)3 is 3.2e-10. What is the concentration in a solution prepared by mixing 50 mL of O.0250 M Ce with 50 mL of 0.040 M IO3? Back of book has 7.0e-3 M
Choose the selection which correctly identifies the forces which must be overcome to convert NH3 from a liquid to a gas. a) Only London dispersion forces must be overcome. b) Only dipole-dipole forces must be overcome
Calculate the theoretical yield for the bromination of both stilbenes and cinnamic acid, assuming the presence of excess pyridinium tribromide.
A voltaic cell is based on the reaction Sn + I2 = Sn2+ + 2I-.
Calculate the pressures in the flask in parts a and b (in torr) if the atmospheric pressure were instead 675 torr.
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