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One mole of ideal gas at 25 degrees is trapped in a cylinder by a piston at 50.0 bar pressure. The piston is released isothermally in three separate stages, first decreasing pressure to 30.0 bar, then to 10.0 bar, and finally to 0.500 bar. Calculate the net work done on the surroundings by these three irreversible expansions. Compare this value with the amount of work that would be done in a reversible isothermal expansion from 50.0 to 0.500 bar at 25.0 degrees.
Calculate the work done (in Joules) by the gas if it expands. (a) against a vaccum
Benzoyl peroxide, the substance most widely used against acne, has a half-life of 9.8 multiplied by 103 days when refrigerated. Assuming a first-order decay law, how long will it take to lose 8% of it potency (92% remaining)
The isothermal compressibility of graphite is 1.56 × 10-7 bar-1. At what pressure is density equal to density of diamond?
The acid-dissociation constants of sulfurous acid (H2SO3) are Ka1= 1.7 x 10^-2 and Ka2 = 6.4 x 10^-8 at 25 degrees celcius. Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.
A solution was prepared to have a density of 1.20 g/mL and a molality of 2.24 m at 22oC. The Mm of the solute is 63.10 g/mol. (a) What is the molarity of the solution?
Ammonia gas and hydrochloric acid vapor undergo a reaction to produce solid ammonium chloride. The reaction equation is given below together with relevant thermodynamic data at 298K
Write a detailed mechanism for this reaction that accounts for the net retention of detailed mechanism for this reaction that accounts for the net retention of configuration when Ag+ and a low concentration of hydroxide are used.
Is the central carbon atom sp2- or sp-hybridization? What about the hybridization of the terminal carbons? What shape do you predict for allene?
Calculate Pt, in atm, for three different gases at partial pressure of 144cm, 800mm, and 1.3m of Hg.
Explain how the sponge nucleoside cytosine arabinoside and fungal nucleoside cordycepin combat cancer (give their structures as well).
Calcium carbide, CaC2, reacts with water to form acetylene. CaC2(s) + 2 H2O(l) -> C2H2(g) + Ca(OH)2(s)
Predict whether each of the following salts will form an acidic, basic or neutral solution. for acidic and basic solutions write an equation for the reaction that takes place. a)Na2SO4 b)KBr c)BaCl2 d)NH4I
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