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Strontium 90- is one of the products of the fission of uranium -235. This strontium isoptope is radioactive, with a half-life of 28.1 years. Calculate how long (in years) it will take for 5.63g of the isotope to be reduced to .354g by decay
The freezing point depression constant, Kf, for water is 1.86?C/m. Suppose that 5.00 g of mercury(I) nitrate was dissolved in 100.0 g of water.
A weather balloon at launch is partially inflated with 3.00 times 10 power 4l of helium at STP. what will be the volume of helium at an altitude of 7km, where the pressure is 0.41atm and the temperature is -20 degrees Celsius?
Write a mechanism for the base-catalyzed hydrolysis of methyl salicylate. 2.) Devise another route by which methyl salicylate can be converted to acetylsalicylic acid
For weak acid, HX, Ka = 1.0 10^-6. Calculate the pH of a 0.82 M solution of HX.
Calculate the mass of nitrogen dissolved at room temperature in an 94.0 home aquarium. Assume a total pressure of 1.0 and a mole fraction for nitrogen of 0.78.
A gas mixture with a total pressure of 750 contains each of the following gases at the indicated partial pressures: , 253 ; , 120 ; and , 173 . The mixture also contains helium gas.
The rate constant of some reaction double with 10 degree rise in temperature. Assume that a reaction takes place at 295 K and 305 K. What must the activation energy be for the rate constant to double as described?
what is the functional groups and molecular formula of aspartame, the NH2 is below the 3rd C and the CH2 is below the 5th C
Determine which girl has the solutions at the concentrations desired and Girl A dilutes 10 mL stock solution to a final volume of 20 mL. Girl B dilutes 10 mL stock solution to a final volume of 40 mL.
A current of 11.3 A is applied to 1.25L of a solution of .552M HBr converting some of the H+ to H2(g).
What volume (L) of H2 at 745 torr and 20.oC can be prepared from 4.8 g of water? (Atomic weights: Fe = 55.85, O = 16.00, H = 1.008; 1 atm = 760 torr).
Consider the autodissociation of water as the behavior of an Arrhenius acid. Use this to explain the temperature dependence of the autoionization of water and use it to explain
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