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Determine the mass of solid sodium formate of MW 68.0 must be combined to 150 mL of 0.66 mol/L HCOOH to make a buffer solution having a pH =3.85? given that Ka for formic acid= 0.00018.express your answer in units of g
Identify the element oxidized and reduced in the following redox rxn. Also indicated the number of electrons lost/gained by each atom.
A student measures k for a certain blue dye to be 24.16 M-1 at 560 nm.What is the molarity of the dye in a solution with an absorbance of 0.118 at 560nm?
Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the molecular formula of the compound? Draw the lewis structure
1) What is the overall charge state for the tetrapeptide DREAM at physiological pH. The pK values for N-terminal, C-terminal, side chain of asp, arg, glu are 9.0, 3.5, 3.9, 12.5, and 4.1
In Europe, gasoline efficiency is measured in km/L . If your car's gas mileage is 30.0 miles/gal, how many liters of gasoline would you need to buy to complete a 284- km trip in Europe?
Compute the moment of inertia of the molecule in kg m 2 . And also determine the greatest wavelength of the radiation that can excite the molecule into rotation.
The pH at one half the equivalence point in an acid-base titration was found to be 5.73. What is the value of Ka for this unknown acid?
For the reaction 2A + B --> 2C, if B is initially 4.0M and 2min later is 3.0M, what is the rate of appearance of C?
is it possible to determine the amount of impurity formed in aspirin with excess sodium salt. aspirin had a melting point range of 113-135 degrees celsius. that is all the information given. any other info can be used.
reaction flask and allowedd to come to equilibrium at 250 C: PCL5--> PCl3 +Cl2 if the amount og chlorine in the equilibrium mixture is 0.470mol, calculate (a) the euilibrium concentration of each gas, (b) Kc, (c) the fraction of PCl5 dissociated.
Which of the following substances would have a standard enthalpy of formation equal to O kj/mol. Select all that apply
How many electrons must aluminum lose before it can reach a stable electronic configuration? Use the table of ionization energy to justify your answer.
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