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A particular radioactive isotope has a half-life of 20.8 days. If you have 32.5 mg of the isotope at the beginning of the week, how many milligrams would you have 40 days later?
A sample of a liquid hydrocarbon know to consist of molecules with five carbon atoms is vaporized in a .204 L flask by immersion in a water bath at 101?. The barometric pressure is 767 torr, and the remaining gas weighs .482 g. What is the molecul..
What mass of solid sodium formate (of MW 68.01) must be added to 110 mL of 0.55 mol/L formic acid (HCOOH) to make a bu?er solution having a pH of 3.84? Ka = 0.00018 for HCOOH
A 100 mm diameter silicon wafer is oxidized completely. What is the thickness of the resulting SiO2 wafer? The molecular weight of Si is 28 g/mol and of SiO2 is 60 g/mol.
what is the mass number of an iron atom that has 28 neutrons? calculate the number of neutrons ofnbsp239pu. write the
Find the activation energy barrier for this reaction. What temperature should I use if I want the reaction to have a rate constant that is 10 times bigger than the rate constant found at 600K
The compounds below cannot be identifed from IR and H NMR spectra alone. Explain. Suggest how other types of spectroscopy might be useful in solving the structure
what is the formula for calcium oxalate dihydrate when 100 degree Celsius heat is added?
What are the equilibrium partial pressures? Nitrogen dioxide decomposes according to the reaction given below where Kp = 4.48 x10^-13
If 20.0g of CO2 gas has a volume of 0.39L at 325K , what is its pressure in millimeters of mercury. I think the question that is similar to this in the question archive was answered incorrectly during one of the final steps.
Hydrochloric acid (58.0mL of 0.235M) is added to 212.0mL of 0.0567M Ba(OH)_2 solution. What is the concentration of the excess H^+ or OH^- ions left in this solution
What is the new molarity of a solution when 650mL of water are added to 500.0mL of a 3.2 molar solution?
32.5 kJ/mol°GD Muscles are powered by the hydrolysis of Adenosine tri phosphate determine Keq for this reaction
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