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A solution is prepared by dissolving 20.0 g of K2HPO4 and 25.0 g of KH2PO4 in enough water to produce 1.0 L of solution. What is the pH of this buffer?For phosphoric acid (H3PO4), Ka2 = 6.2 10^-8.
A) 7.70B) 7.42C) 7.21D) 7.00E) 6.72
A .117 gram sample of a metal reacts with hydrpchloric acid to produce 36.3mL od dry hydrogen gas. what is the equivalent weight of this metal.
A 5.0 mL sample of vinegar was titrated with 7.2 mL of 0.55 M NaOH(aq). If the density of the vinegar solution is 1.00 g/mL, what is the mass percent of acetic acid present?
For an ensemble consisting of a mole of particles having two energy levels separated by 1000. cm-1, at what temperature will the internal energy equal 2.90kJ?
In the electrolysis of aqueous NaCl, how many liters of Cl2(g) (at STP) are generated by a current of 7.50 A for a period of 100. min.
The mass of a cube of iron is 363 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
if your input is a radiative heat source at 150 C, what is the rate at which heat needs to be added to produce the desired work and at what temperature will the engine dump exceess heat?
There are 2.2 mg of lead in exactly 500 g of a water sample. What would the concentration of lead be in parts per million.
a solution of 100 ml of .200 M KOH is mixed with a solution of 200 ml of .150 M NiSO4. what is the chemical equation, what precipitate forms, what is the limiting reagent, and how many grams of the precipitate form?
A lactic acid/lactate ion buffer solution contains 0.29 M hc3h5o3 and 0.80 M C3H5O3-, respectively. The Ka value of lactic acid is 1.4X10^-4. Calculate the pH of this buffer.
What is the wavelength (in meters) of photons with the following energies? In what region of the electromagnetic spectrum does each appear? given 90.5KJ/mol
An electron in the ground-state He+ ion undergoes a transition to a state described by the wavefunction R4,1(r)Y1,1(?,). (a) Describe the transition using term symbols. (b) Compute the wavelength, frequency, and wavenumber of the transition.
In a particular experiment, 2.25 g of NH3 and 3.75 g of O2 are placed in a container and allowed to react. How many grams of NO will have been formed when all of the limiting reactant has been consumed?
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