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What are the values of the entropy changes (system, surroundings, and universe) for the cooling of 1 mol of O2 (g) from 298 K to O2 (l) at 90.19 K if the process is done a. Reversibly b. Irreversibly by placing the sample in liquid hydrogen at 13.96 K? Assume enthalpy change of vaporization is 6820 j/mol at 90.19 K and Cp = 7/2 R for the gas.
A white solid precipitate was dissolved with 6M NH3. The filtrate on adding 6M HNO3 yielded a white precipitate again. This confirms the presence of
An unknown radioactive substance has a half-life of 3.20 hours. If 38.7g of the substance is currently present, what mass was present 8.00 hours ago
Peonin is a red pigment found in the petals of peony flowers. Why do you think peonin is bonded to two hexoses? What monosaccharide(s) would be produced by acid-catalyzed hydrolysis of peonin?
A student determines that a 5.869g sample of solid displaces 1.75 mL of water in a graduated cylinder. Another student measures a 7.254g sample of the same metal. What volume of water should the second sample displace
What is the empirical formula of a hydrocarbon if complete combustion or 6.000 mg of the hydrocarbon produced
Use electronegativity values to arrange the following bonds in order of decreasing polarity: N-O, N-N, N-P, and C-N
calculate the pH of solution formed by mixing 150 mL of 0.10M HC7H5O2 with 100 mL of 0.30M NaC7H5O2. The Ka for HC7H5O2 is 6.5 E -5
Write the lewis structure for SeF6. What is the general "ABX" structure, shape name, and molecular polarity?
A 3.18 L sample of hydrogen chloride (HCl) gas at 1.64 atm and 31 degrees C is completely disolved in 710 mL of water to form hydrochloric acid solution. Calculate the molarity of the solution. Assume no change in volume
question if the work function for a metal is 1.8 ev what would be the stopping potential for light having a wavelength
What about the molecule as a whole? Is that molecule CH4 a polar or non-polar?
zinc reacts with hydrochloric acid according to the following balanced chemical equationzn s 2 hclaq zncl2aq h2ga
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