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What is the molar solubility of lead chromate in 0.10 M HNO3 if the Ksp for PbCrO4 is 2.8 x 10^-13 and Ka2 for H2CrO4 is 3.0 x 10^-7? Note that H2CrO4 is considered to be a strong acid.
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5.
The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?
The solubility product for Zn(OH)2 is 3e-16. The formation constant for the hydroxo complex, Zn(OH)4 2- is 4.6e17. What is the minimum concentration of OH- required to dissolve 1.2e-2 mol of Zn(OH)2 in a liter of solution
What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation?
At what pressure does the mean free path of argon at 25 C become comparable to the diameter of a spherical vessel of volume 1.0dm3 that contains it? ? =.36nm^2
a student performs two melting-point determinations on a crystalline product. in one determination, the capillary tube contains a sample about 1-2 mm in height and the melting range is found to be 141 degree - 142 degree celsius
If it solidifies isothermally at 55 K below the equilibrium (normal) melting point of Cd, what is magnitude of the energy transferred to the plate
A piece of a newly synthesized material of mass 25.0 g at 80.0C is placed in a calorimeter containing 100.0 g of water at 20.0C. If the final temperature of the system is 24.0C, what is the specific heat capacity of this material?
what is the molar mass of the protein? A solution of 7.50 mg of a small protein in 5.00 ml of aqueous solution has an osmotic pressure of 6.80 torr at 23.1 degrees celcius.
The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the alloy? (c of water is 4.184 J/g×K)
25mL of 0.1545M hydrochloric acid is added to a tablet portion. If it takes 6.38 mL of 0.1567 M sodium hydroxide to titrate the excess hydrochloric acid, how many moles of acid were neutralized by the tablet portion
What are the relative populations of these levels at the boiling if the degeneracy level is 2j+ 1? Is the ground state most highly populated level?
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