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A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be 425 cubic centimeters, and total mass is 4.22 kg. What percentage of the spheres are copper?
A solution is prepared by mixing 50.0 mL of 0.29 M Pb(NO3)2 with 50.0 mL of 1.9 M KCl. Calculate the concentrations of Pb2+ and Cl at equilibrium. Ksp for PbCl2(s) is 1.6 x10-5.
Calculate the quantity of energy produced per mole of -235 (atomic mass = 235.043922 ) for the neutron-induced fission of -235 to produce -137 (atomic mass = 136.9253 ) and -97 (atomic mass = 96.910950 ).
It takes 254kj/mol to eject electron for a certain metal surface. What is the longest wavelength of light that can be used to eject electrons from the surface of this metal via the photoelectric effect.
a mixture contains two compounds x and y. both compounds x y have a solubility 1 g100 ml of solvent at the temperature
A mixture containing only BaSO4 and CaSO4 contains one-half as much Ba2+ as Ca2+ by weight. What is the percentage of CaSO4 in the mixture
defined lead free paint as having less than 75mg of lead per 125mg of paint. How many parts per million of lead is this?
Why does the water solubility of the acidic compound change when going from the aqueous base to the aqueous acid? pls write the eq'n to illustrate this change.
What is the hydronium ion concentration of a 0.500 M acetic acid solution with Ka = 1.8 x 10-5? The equation for the dissociation of acetic acid is: CH3CO2H(aq) + H2O(l) H3O+(aq) + CH3CO2-(aq)
Determine the frequency, in hertz, of radiation having energy of 4.08×10?21 J/photon b. Determine the wavelength, in nanometers, of radiation with of 218 kj/mol energy
A solution of ammonia and water contains 4.70×10 water molecules and 5.50×10 ammonia molecules. How many total hydrogen atoms are in this solution?
What is the balanced equation for a reaction between potassium iodide and lead II chloride
Draw a logarithmic concentration diagram showing the relationship between [CO2] and [Ch4] as a function of pE for pH=7 and [CO2] +
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