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An isotope of element 102, with a mass number of 253 was produced by bombarding 24096Cm with a projectile, which was absorbed by the target nucleus. This projectile should be ___.
The standard reaction enthalpy for the docomposition of CaCl2.NH3(s) into CaCl2(s) and NH3(g) is nearly constant at +78kJmol-1 between 350 K and 470 K. The equilibrium pressure of NH3 in the presence of CaCl2.NH3 is 1.71kPa at 400K. Find an expression for the temperature dependence of change in Gibbs free energy in the same range
Calculate the percent ionization of a 0.578 M solution of hydrofluoric acid.
% Ionization = %
What is the pH of an aqueous solution of 3.99×10-2 M nitric acid?
pH =
2NOBr(g) 2NO(g) + Br2(g)
If 0.364 moles of NOBr(g), 0.448 moles of NO, and 0.543 moles of Br2 are at equilibrium in a 19.1 L container at 464 K, the value of the equilibrium constant, Kc, is .
The vapor pressure of benzene is 73.03 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in benzene is TNT.
Calculate the vapor pressure of the solution at 25 °C when 8.249 grams of TNT, C7H5N3O6 (227.1 g/mol), are dissolved in 236.0 grams of benzene.
benzene = C6H6 = 78.12 g/mol.
VP(solution) = mm Hg
An aqueous solution is made by dissolving 29.4 grams of nickel(II) nitrate in 403 grams of water.
The molality of nickel(II) nitrate in the solution is m
An aqueous solution of sodium bromide, NaBr, contains 3.40 grams of sodium bromide and 17.4 grams of water.
The percentage by mass of sodium bromide in the solution is %.
The equilibrium mixture is found to contain 0.07, 0.11,0.03 and 0.03 moles of CO ,H2, CH4, H2O respectively for the reaction:
CO(g)+3H2(g)0. CH4=H2O(g)
You need to make an aqueous solution of 0.140 M potassium nitrate for an experiment in lab, using a 125 mL volumetric flask.
How much solid potassium nitrate should you add?
blank grams
