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Suppose that you precipitate a protein with 1 M (NH4)2SO4 and that you wish to reduce the concentration of the (NH4)2SO4. You take 1 ml of your sample and dialyze it in 1000 ml of buffer. At the end of dialysis what is the concentration of (NH4)2SO4 in your sample? How could you further lower the (NH4)SO4 concentration?
Compute pH and [OH-] for each of the following solutions. (a) 8.1×10-2M Na2CO3, (b) 0.15M NaCN
Write the chemical equation for the formation of HBr from H and Br atoms. Lone pairs do not need to be included. Using the table of bond energies determine the ?H for the above reaction. (KJ/Mol)
If 132 mL of wet H2 is collected over water at 24°C and a barometric pressure of 736 torr, how many grams of Zn have been consumed?
What is the mole fraction of benzene in the vapor above the solution described in part (a)
The electrons in the bonding orbital tend to be distributed between the two atoms. This is because of their tendency to be shared among the two nuclei.
If a mixture containing 27.76 g each of NH4Cl and Ca(OH)2 is heated, how many grams of NH3 will be produced. Which reactant remains in excess, and in what mass
Calculate the final volume of the reaction mixture: B. Calculate the number of moles of each reagent (acetone, iodine, and acid) in the resulting reaction mixture: acetone: iodine: acid:
Express the molar concentration numerically using two significant figures. What is the final concentration of D at equilibrium if the initial concentrations of A = 1.00M and B= 2.00M
The balanced chemical equation is N2+O2 2NO.If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established
a coffee contains 100 mL of H2O. initial temperature of calorimeter is temperature 23 C.if 8.20 g of CaCl2 is added to calorimeter. what will be the final temperature of the solution in the calorimeter.
When one mole of hydrogen decomposes into H atom the change in enthalpy is 435. 88 kJ/mole. What is the formation enthalpy, ?Hf for hydrogen atom
Molecule with 3 single bonds and 1 lone pair of electrons around the central atom is predicted to have what type of molecular geometry? d. which of the following molecules is polar? PBr5, CCl4, BrF5, XeF2, XeF4 e. a sp3d hybridized central atom ha..
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