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If all the SCN- were not converted completely to FeNCS2+ when the calibration curve was prepared, would this raise or lower the value of Keq?
Estimate the equilibrium constant for the weak base C6H5CH2NH2, if a 4.53×10-1 M aqueous solution of C6H5CH2NH2 has a pOH 4.84 (make an exact calculation assuming that initial concentration
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
Ionization energy is the energy needed to eject an electron from an atom. Compute the ionization energy of a hydrogen atom in its first excited stat (n=2)
What is the characteristic of matter that causes it to expand when the temperature increases and contract when the temperature decreases?
Calculate the difference in molar entropy (a) between ice and liquid water at 5.00 °C, and (b) between liquid water and its vapor at 90.0 °C and 1.00 atm. The differences in molar heat capacities on melting and on vaporization
The second-order reaction 2 Mn(CO)5 Mn2(CO)10, has a rate constant equal to 3.0 x 10^9 M-1 s-1 at 25C. If the initial concentration of Mn(CO)5 is 2.0 x 10-5 M, how long will it take for 90.% of the reactant to disappear?
If composite, define each simple sub-system and the internal restraint. If the vessel is shaken vigorously. Is the system then a simple or composite system?
Calculate the cell potential for a galvanic cell made from an iron electrode in a 1.75 M solution of Fe(NO3)2 and a silver electrode in a 5.00 x 10-3 M solution of AgNO3 at 298 K. Eºcell
the addition of h2 to cc double bonds is an important reaction used in the preparation of margarine from vegetable
What is the difference between the molecular geometry
enough solid KHT be added to the kcl-nacl solution to ensure that some solid remain undissolved after 20 minutes stirring?
A solution contains 6.25g calcium nitrate [Ca(NO3)2]2 in 430.0g of water. Express the concentration of calcium nitrate as mole fraction and molality.
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