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The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(II) oxide.
HgO(s) Hg(l) + ½O2(g) Ho = 90.84 kJ
Use the data given below to estimate the temperature at which this reaction will become spontaneous under standard state conditions.
So(Hg) = 76.02 J/K molSo(O2) = 205.0 J/K molSo(HgO) = 70.29 J/K mol
The pH of a 0.100 M formic acid solution (HCHO2) is 2.38 at 25 °C. Determine the Ka and pKa of formic acid
A researcher suspects that the pressure gauge on a 49.9-L gas cylinder containing nitric oxide is broken. An empty gas cylinder weighs 135 lb. The weight of the partially full cylinder is 161.5 lb. This cylinder is located in a relatively chilly s..
An underground reservoir contains natural gas at a pressure of 425 kPa and a temperature of 15 °C. If the volume of the reservoir is 1.3 x 104 kL
What volume of O2 at 988 mmHG and 33 degree celsius is required to synthesize 12.5 mol of NO
A 0.10-mole quantity of CuSO4 is added to a liter of 1.0 M NH3 solution. What is the concentration of Cu2+ at equilibrium. [The formation constant for Cu(NH3)42+ is Kf = 5.0 x 1013.]
What is the percent H2SO4 for a solution consisting of 4.62 equivalencies of H2SO4 mixed with 11.2 kg of water if both portions
Aminabhavi et al. [T. M. Aminabhavi, V. B. Patil, M. I. Aralaguppi, J. D. Ortego and K. C. Hansen, J. Chem. Eng. Data 41, 526 (1996)] examined mixtures of cyclohexane with various long-chain alkanes.
Determine the enthalpy for the partial combustion of methane to carbon monoxide.
Is the radial node of the hydrogen 2s wavefunction inside or outside (relative to the nucleus) of the most probable radius of the 1s state?
A solution of butanoic acid is prepared from 0.067 mol of butanoic acid in sufficient water to give 1.0 L of solution and has a pH of 2.72. Determine the Ka for the butanoic acid solution
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 -> NH4+(aq) + NO3(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places. Enter scientific notation as 1.23E4. (a) When ..
At a certain temperature, Keq = 150. Calculate the concentrations of Fe 3+ and SCN- in a solution that has an equilibrium FeSCN2+ concentration of 4.5 X 10^-5 M using the equation . Assume the equilibrium concentrations of Fe3+ and SCN- are equal.
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