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You have a sample of bone collected from Nevada and you find that it contains strontium-90 and exhibits an activity of 2.5 Bq. How much strontium-90 was present in the bone when the animal died 45 years ago?(The half-life of 90Sr is 29 years.)
Describe the molecule xenon trioxide, XeO3, using four possible Lewis structures, one each with zero, one, two, or three Xe-O double bonds.
how many moles of excess reactant are present when 2.90*10^2 ml of .182 M sulfuric acid reacts with .423 L of .170 M sodium hydroxide to form water and aqueous sodium sulfate?
A pound of coffee beans yields 40 cups of coffee (4 cups = 1 ). How many milliliters of coffee can be obtained from 1.0 of coffee beans?
If 95.0 mg 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.
Calculate E when 900.0 g of CH3OH(g) completely reacts at a constant temperature of 300 K and constant pressure of 0.95 atm. R = 8.314 J/mol*K and R = 0.08206 atm*L/mol*K
Can complex compounds like dioxin and furan actually be thermally oxidized and destroyed?? At what temperature would these compounds actually be destroyed.
water can react with an acid or a base to produce two different products. draw the structure of each and label products
A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0 C,the volume of the gas is 361 mL. To what temperature must the gas be heated to occupy a volume of 492 mL.
at 900K the following reaction has kp=.345: 2SO2(g)+O2(g)-->2SO3(g) Partial pressures of SO2 is .150 and of O2 is .455. What is the equilibrium partial pressure of SO3?
Using ethanol as the source if all carbon atoms, outline multistep synthesis
Compute the heat amount required to heat a 3.9kg gold bar from 28 degree Celsius to 68 degree Celsius. Given Specific heat capacity of gold = 0.128 J/g°C.
Assume you can heat up or cool down the reaction flask as needed for the reaction to proceed with practical rates even if no temperature is indicated in the table
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