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Codeine (C18H21NO3) is a narcotic pain reliever that forms a salt with HCl. What is the pH of 0.069 M codeine hydrochloride (pKb of codeine is 5.80)?
acetic acid is placed in a flask and is titrated with 25.00 mL 0.100 M sodium hydroxide
A balloon is filled with helium to a volume of 1.05 x 10^3 L on the ground, where the pressure is 745 mm Hg and the temperature is 20. °C. When the balloon ascends to a height of 2 miles
Calculate the pH of the solution that contains following compounds. Some relevant Ka values are Ka(CH3COOH)=1.7 X 10 ^-5, Ka(HNO2)=7.2X 10^-4, and Ka(NH4+) = 5.6 x 10^-10.
Why would the cell potential be higher with the addition of 6 M Na2S solution to .001 M of CuSO4 (compared to 6 M NH addition to .001 M CuSO4)
The element lithium has two naturally occurring isotopes, 7Li (isotopic mass 7.0160 amu, abundance 92.5 %) and 6Li (isotopic mass 6.0151 amu, abundance 7.50 %). Calculate the atomic mass of lithium.
Calculate the pH of 0.300 L of a 0.500 M NaHSO3 / 0.300 M Na2SO3 buffer before and after the addition of the following solutions. Assume that the volume remains constant.
If a laser operated on the n=5 to n=2 transition of a H atom, what wavelength in nm photon would be emitted? (E2= -82 kJ/mol, E1= -328 kJ/mol)
What volume of 1.00M HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.100M Na2Co3
Calculate the biological standard Gibbs energies of reactions of the following reactions and half-reactions: (a) 2 NADH(aq) + O2(g) + 2 H+(aq) ? 2 NAD+(aq) + 2 H2O(l) E? = + 1.4 V
the absolute entropies of the solid and liquid metal are 24.0 and 66.2 J/K.mol, respectively, at the melting temperature. Calculate the melting point of the metal
A sample of gas occupies 10.5 L at 600 torr and 50C. What volume will it occupy at STP?
How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron (C = 0.448 J/goC) from 22.0 oC to 100.0 oC?
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