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A phase change occurs at 298 K and deltaS system - -13.5 J/K. What is the change in the entropy of the surroundings?
a. 27.0 J/K
b. -40.5 J.K
c. 13.5 J/K
d. -6.75 J/K
Evaluate reversibility of a process where an ideal monoatomic gas is first slowly compressed 10-fold by a gradually increasing external pressure (gas remains in thermal equilibrium with the surroundings)
Ascorbic acid is titrated with 23.1 mL of 0.5 M KIO3. How many moles of ascorbic acid are present?
How long would it take to electroplate a metal surface with 0.500 g nickel metal from a solution of Ni 2+ with a current of 4.0 A?
a sodium hypoclorite liquid bleach is placed in a 250 mL volumetric flask and diluted to the mark. A 25.00 mL aliquot of this solution is placed in a 250 mL Erlenmeyer flask. What volume of the original liquid bleach is in the Erlenmeyer flask?
Propose structures for aromatic hydrocarbons that meet the following descriptions:
hydrogen gas is generated when calcium reacts with water. the volume of gas collected over water at 30 degree celcius and pressure of 988 mm Hg is 641 ml. what is the mass in grams of the hydrogen gas obtained? the pressure of water vapor at 30 de..
what is the mole fraction of magnesium chloride in a solution prepared by adding 15 grams of magnesium chloride
In the first step of the trypsin mechanism, the side-chain oxygen of Ser 195 attacks the carbonyl carbon of the substrate. Use PyMOL and your model of the enzyme substrate complex to determine the distance between these two atoms.
A sample of H2SO4 contains 1.11 grams of H (1.01 g/mol). How many moles of H2SO4 (98.02 g/mol) are present?
Polyisobutylene (PIB) is equilibrated in propane vapor at 35 oC. At this temperature, the saturated pressure (p10) of propane is 9050 mm Hg and its density is 0.490 g/cm3
Suppose that 1.02 of rubbing alcohol evaporates from a 75.0 aluminum block. If the aluminum block is initially at 25C, what is the final temperature of the block after the evaporation of the alcohol?
Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees celsius to 67 degrees celcius.
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