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A refrigerator is the reverse of an engine: work is performed to remove heat from a system, making it colder. The efficiency of a refrigerator (often termed the coefficient of performance) is defined as q3/wcycle = Tlow/(Thigh-Tlow).
Use this definition to determine the efficiency needed to halve the absolute temperature. What does your answer imply about attempts to reach absolute zer?
The original molarity of a solution of formic acid with a Ka of 1.7x10^-4. Its pH is 4.52 at equilibrium is _____ mol/L
what is the molality of a solution of 10g benzophenone and 1mL of cyclohexanone
what is the energy required for an electronic transition from n = 2 to n = 3 in a hydrogen atom? A. 7.87E-19J B. 5.45E10-19J C. 3.03E10-19 D. 2.42E-10J
A solution is made by combining 15.0 mL of 18.0 M acetic acid with 5.50 g of sodium acetate and diluting to a total volume of 1.50 L. Calculate the pH of the solution.
Find the temperature of 3 grams of chlorine gas in a 1.5 L container with 801 mmHg of pressure.
The half of cesium-137 is 30.2 years. If the initial mass of sample of cesium-137 is 1,000 g, how much cesium will remain after 151 years.
The figure shown below shows a typical titration curve for 0.1 M NaOH with 40 mL of 0.05M oxalic acid (H2C2O4). The first equivalent point is ~ at 9 .0 mL and the second equivalent point is at ~18 mL.
The unit cell for tin has tetragonal symmetry, with a and b lattice parameters of 0.583 and 0.318 nm, respectively. If its density, atomic weight, and atomic radius are 7.30 g/cm3, 118.69 g/mol, and 0.151 nm, respectively, compute the atomic packi..
a proton in a linear accelerator has a de broglie wavelength of 128 pmwhat is the speed of the
Describe procedures for preparing each of the following compounds, using ethanol as the source for all of their carbon atoms (you can use any reagent you like, but every carbon in every product below must have originated in ethanol; once you prepa..
What is the potassium ion concentration in a 2.5 m k2so4 aqueous solution
4 hno3aq cus gt cuno32aq 2 h2ol 2 no2gconsidering which elements are being oxidized and reduced determine how many
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