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A sample of Tl-201 has an initial decay rate of 5.88 x 10 to the 4 seconds. How long will it take for the decay rate to fall to 55/s? (Tl-201 has a half-life of 3.042 days).
of 2.60 cm^2.if solar radition is 1150 W/m^2, how many photons strike the leaf every second.
Calculate the percent composition and determine the molecular formula and the empirical formula for the carbon-hydrogen-oxygen compound that results when 30.21 g of carbon, 40.24 g of oxygen, and 5.08 g of hydrogen are reacted to produce a product..
Name four hydrocarbon types. Give 1 example for each type. Write chemical formula, structural formula and condensed structural formula for each example.
write an essay that explains the energy changes that occur during a chemical reaction. when is energy absorbed and when
The molar mass of a compound is 360. If the empirical formula is NO, what is the molecular formula
There are several aromatic compounds with the formula C8H9Cl. Name those that have a trisubstituted ring where the methyl groups are oriented meta
What is the mass change (in grams) accompanying the formation of CO and H2 in the water gas reaction?
A certain reaction with an activation energy of 185 kJ/mol was run at 485K and again at 505K. What is the ratio of f at the higher temperature to f at the lower temperature
Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET). The half-life of nitrogen-13 is 10.0 minutes. How much time is required for the activity of a sample of nitrogen-13 to fall to 14.2 percent of its..
The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii.
Suflur dioxide may be catalytically oxidized to sulfur trioxide. How many grams of sulfur dioxide could be converted by this process if 100.0 grams of oxygen are available for the oxidation?
Without including them in the electronic configuration, please say how many valence electrons are in Mo2+, Pb2+, Cr3+ and Ag+. just a bit confuse with what shells are the outer ones
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