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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 electron in the n = 5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
A 0.2527-g sample of a mixture of Mg(OH)2 and Al(OH)3 was treated with 50.00 mL of 0.225 mol L^-1 HCl(aq). The resulting solution required 13.73 mL of 0.176 mol L^-1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass..
which molecule will undergo only london dispersion forces when interacting with other molecules of the same kind?
Use the van der Waals equation to calculate the pressure, in atm, of 37.83 mol of hydrogen at 113 oC in a 2.7 L container.
What is temperature of boiling water in Denver (in?C) at an elevation of 6000 ft ? 2000 m given that atmospheric pressure at that altitude is about 0.8 atm?
Cd2 forms two complexes with C2H3O2, with the following formation constants:(a) Find K2 for the reaction, (b) You prepare 1.00 L of solution containing 0.110 mol CH3CO2Na and 4.00 × 10-4 mol Cd(ClO4)2. Compute the fraction of cadmium in the form ..
water consistent with this oversimplified approach? Explain your answer ( note that there is a threshold temperature below which this approach will have a significant error)
The alpha particles emitted by radon-222 have an energy of 8.8 x 10^-13 J. If a 200. g Pb brick absorbs 1.0 x 10^10 alpha particles from radon decay, what dose in rads will the brick absorb
Determine the boiling point of a solution of 72.4 g of glycerol dissolved in 122.5 g of water.
Sodium bromide, used to produce silver bromide for use in photography, can be prepared as shown in the following equations. How many kilograms of iron are consumed to produce 4.15 × 104 kg NaBr
If the sample contains a combined total of 1.75 grams per mole and has a total mass of 51.0 grams, what are the percentages of CO2 and Ne in the sample by mole?
The heat of vaporization of a liquid is the energy required to vaporize 1.00 mol of a liquid at its boiling point. In one experiment, 60.0 g of liquid nitrogen (boiling pt = -196C) is poured into a Styrofoam cup containing 200.0 g of water at 55.3..
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