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Pulsed lasers are powerful sources of almost monochromatic radiation. Lasers that emit photons in a pulse of 10.0 ns duration with a total energy of in the pulse of 0.10 J at 1000.0 nm are commercially available. Explain what is the average power energy per unit time in units of Watts associated with such a pulse? Define how many 1000.0 nm photons are emitted in such a pulse?
In the laboratory you are asked to make a 0.648 m cobalt (II) bromide solution using 350 grams of water. How many grams of cobalt (II)
A tank containing carbon dioxide at 400K and 50 bar is vented until the temperature in the tank falls to 300K. Assuming there is no heat transfer between the gas and the tank
A compound composed of elements X and Y is 1/3X by mass. The atomic mass of element X is 1/4 the atomic mass of element Y. Find the empirical formula.
calcium nitrate and ammonium fluoride react to form calcium fluoride dinitrogen monoxide and water vapor. what mass of
A 144-mL portion of that solution is diluted by adding 169 mL of water. What is the final concentration? Assume the volumes are additive.
synthesis gas can be made by reacting red-hot coal with steam. estimate the temperature at which the equilibrium
Nitrogen boils at -320F What is the temperature on the Celsius scale. Please show your solution to problem
In a particular solution, [Cr3+]=3.9x10-4 mol/L. What is the minimum pH at which Cr(OH)3(s) will precipitate from this solution. Assume the temperature is 25oC. For Cr(OH)3(s), Ksp=6.3x10-31 at 25oC. Give your answer with three digits
determine the mass of snow that can be completely melted.use the table below to work the following
The ability to sense odor is not the only chemoreceptor response in the human body.
which of the four main categories of biological compounds-carbohydrates lipids proteins and nucleic acids-contains the
the vapor pressure of dichloromethanech2cl2 at 0 degrees c is 134 mmhg. the normal boiling point of dichloromethane is
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