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a. What happens to a radioactive isotope over the course of 1 half-life?
b. How does the half-life of an isotope relate to the stability of its nucleus?
what is the molecular mass nonionic solutes of 8.02 grams of solute in 861 grams of water lower the freezing point to -0.430 c.
At 186 oC the equilibrium constant for the reaction: 2 HBr(g) H2(g) + Br2(g) is KP = 6.56e-11. If the initial pressure of HBr is 0.00753 atm, what are the equilibrium partial pressures of HBr, H2, and Br2? p(HBr) = . p(H2) = . p(Br2) = .
We mixed ortho vanillin with carbethoxymethylene triphenyphosphorane. I would like to know how the imide was created in the first step. What protonated the amine before the amine protonates the carbonyl
High levels of ozone (O3) make rubber deteriorate, green plants turn brown, and cause people to have difficulty breathing. Calculate delta G at 298 K for the formation of 1 mole of O3 from O2 in urban smog, where [O2]=0.210 atm and [O3]=5.00x10^-7..
Draw a mechanism for this reaction. All compounds involved in each stage of the mechanism must be enclosed in a box, and each box must be connected to the next one with a straight arrow.
How many grams of alum can be obtained from 20.0 g of aluminum when the reaction proceeds with 100% yield? How many grams of alum would be obtained if the reaction were to proceed with 80.0% yield
An existing power plant has been found to produce SO2 concentration of 20?g/m3 at a distance of 800m directly downwind from the stack when the wind is 4m/s from the north during a class C stability situation.
Question- Calculate the freezing point and boiling point of a solution containing 7.60g of ethylene glycol (C2H6O2) in 95.0mL of ethanol. Ethanol has a density of 0.789 g/cm3.
Determine the actual molar and mass fuel/oxygen ratios.- The molar percentage of each combustion product before the exhaust gas was dried for this analysis.
Calculate the solubility of silver chromate in 0.005 M Na2CrO4.
An oxidation-reduction happens in any electrochemical cell; voltaic or electrolytic. (look these terms up in your general chemistry text if you don't remember them.)
Consider the thorough stirring of 0.2 mols Na3PO4 (s) into 1 Liter of 0.2 M H4NHC2O4. For this system write the correct equation for each B/L acid-base rxn of consequence occuring on system prepartion.
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