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Water standing in the open at 32.0°C evaporates because of the escape of some of the surface molecules. The heat of vaporization (539 cal/g) is approximately equal to en, where e is the average energy of the escaping molecules and n is the number of molecules per gram. (a) Find e. (b) What is the ratio of e to the average kinetic energy of H2O molecules, assuming the latter is related to temperature in the same way as it is for gases?
What mass of sucrose should be combined with 468 of water to make a solution with an osmotic pressure of 8.75 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
Classify each mixture by what it indicates about and for the reaction at standard conditions.
Predict the intensities of the peaks at masses 57 and 114 in the spectrum of 2,2,3,3-tetramethylbutane. Support your answer with its corresponding fragmentation reaction.
The most common source of copper Cu is the mineral chalcopyrite CuFeS2. How many kilograms of chalcopyrite must be mined to obtain 300.g of pure Cu
Many household cleaning products contain oxalic acid, H2X2O4 , a diprotic acid with the following dissociation constants: , . Calculate the equilibrium concentration of C2O4^2- in a 0.20M solution of oxalic acid.
What is the iron molar concentration in the serum sample? Not that the following relationship may be used: Aunk/Aunk+std - Cunk/{Cunk+Cstd}
How many photons are required to heat 235 mL of coffee from 25.0 C to 62.0 C? Assume that the coffee has the same density, 0.997g/mol , and specific heat capacity, 4.184 J?g*K, as water over this temperature range.
Calculate the number of molecules inside the cell, which is 2.2 ?m long and 1.2 ?m in diameter.
Calculate the standard enthalpy of formation of gaseous carbon dioxide (CO2) using the following thermochemical information: 2 C(s) + H2(g) C2H2(g) H = +226.8 kJ 2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H = -2599.3 kJ 2 H2O(l) 2 H2(g) + O2(g) H = +..
Suppose a 4.00 L nickel reaction container filled with 0.0090 M H2 is connected to a 5.00 L container filled with 0.296 M F2. Calculate the molar concentration of H2 at equilibrium.
If replacing magnesium with an equal weight of sodium, how would the enthalpy of the reaction changed?
Electrolysis is used to gold plate jewelry made of stainless steel. a) what half reaction takes place to plate Au^3+ on a stainless steel earring? b) is the earring the anode or cathode? c) why is energy needed to gold plate the earring
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