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A buffer containing 0.42 M base, B, and 0.28 M of its conjugate acid, BH+,has a pH of 8.86. What is the pH after 0.0020mol of HCl is added to 0.25 L of this solution?
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. If a solution of caffeine in chloroform (CHCl3) as a solvent has a concentration of 0.0900 m, calculate the the percent caffeine by mass and the mole fraction of caffeine.
The mass of a single copper atom is 1.06E-22 grams. How many copper atoms would there be in 318 milligrams of copper?
What is the pH at equivilance point? c. What is the pH of the solution when 106.4mL of 1.721 M NaOH has been added to the 0.591 M acetic acid solution?
If a solution containing 43.297 g of mercury(II) acetate is allowed to react completely with a solution containing 12.026 g of sodium sulfate, how many grams of solid precipitate will be formed. How many grams of the reactant in excess will remain..
Briefly sketch the major components of the FTIR, showing the pathway of the IR radiation among the components.
Calculate the energies of the first four rotational levels of H^127 free to rotate in three dimensions, using for its moment of inertia I=uR^2, with u= mHmI/(mh+mI) and R= 160 pm.
Chloropropionic acid, ClCH2CH2COOH is a weak monoprotic acid with Ka = 7.94 x 10-5 M. Calculate the pH at the equivalence point in a titration 38.2 mL of 1.05 M chloropropionic acid with 0.90 M KOH
calculate the PH at the points in the titration of 20.00 ml of 0.318M NH3 when, a) 10.00 ml and 15.00 ml of 0.475 M HCl have been added.
Values of the rate constant for the decomposition of N2O5 at four different temperatures are as follows: Determine the activation energy (I got this step right, Ea = 101.15 kJ/mole)
How many molecules of NO2 are needed to react with 0.250 mol of H2O? How many grams of HNO3 are produced when 60.0 g of NO2 completly reacts? How many grams of HNO3 can be produced if 225 g of NO2 is mixed with 55.2 g of H2O
If 72.4 kJ of heat is supplied to a 842 g block of metal, the temperature of the metal increases by 9.0°C. Calculate the specific heat capacity of the metal in J/g·°C.
Medical technicians use deoxyglucose labeled with fluorine-18 to locate tumors using a pet scan. A medical technician injects a patient with a therapeutic dose of fluorine-18.
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