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A fellow student claims that entropy really isn't a state function, for the following reason. Suppose 1.00 mol of an ideal gas expands isothermally and reversibly at 300 K from 10.0 L to 20.0 L. The entropy change for this process is given by ΔS = nR ln (vf/vi) = nR ln 2. Now suppose 1.00 mol of an ideal gas expands isothermally at 300 K against a vacuum from 10.0 L to 20.0 L. Since the expansion is against a vacuum, w = 0; since the gas is ideal and the process is isothermal, ΔE = 0; hence q = 0, and ΔS = 0. Since the gas had the same initial and final states in both experiments, but ΔS had different values, therefore S is not a state function. Is the student correct? If not, identify the error(s) in the student's reasoning.
A saturated solution of lead(II) chloride, PbCl2 , was prepared by dissolving solid in water. The concentration of Pb2+ ion in the solution was found to be 1.62x10^-2 M. Calculate for Ksp for PbCl2.
A solution is made by dissolving 21.5 grams of glucose (C6H12O6) in 255 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m?
Find the standard enthalpy of formation of ethylene, C2H4(g), given the following data: heat of combustion of C2H4(g) = -1411 kJ/mol; ?H°f[CO2(g)] = -393.5 kJ/mol; ?H°f[H2O(l)] = -285.8 kJ/mol.
What is the ph change of a 0.300 M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.130 M with no change in volume
After precipitation is complete, the concentration of the OH- is -0.10M and the measured cell potential is 1.05V. Calculate the Ksp value for Zn(OH)2(s). Zn(OH)2 > Zn^(2+)(aq) + 2OH-(aq) Ksp = ? PLEASE show ALL work, I rate ALL 5 stars.
2k2h2 o rarr2koh h2a 5.00 g chunk of potassium is dropped into 1.00 kg water at 24 deg c. what is the final temperature
At 2000 degree C the equilibruim constant for the reaction 2NO-> N2+O2 is kc=2.4x10^3. the initial concentration of NO is 0.190 M. What is the equilibruim concentration of N2 and O2
Calculate the E0 for the following reaction by using the standard reduction potentials data in your lab manual.
A white precipitate formed. This mixture was centrifuged and separated, and the clear solution was then treated with 1 M Na2Co3. No Preceipitate formed. Which metal ions were present in your unknown? Which metal ions were absent
The solubility product for Pb3(PO4)2 is 1.0 x 10^-54. write out the solubility reaction equation explaining why it is set up that way using the solubility rules or else I will not really understand how to set up the problem.
The molecular weight of vincristine, a pharmaceutical drug
Calculate the height of a column of methanol that would be supported by atmospheric pressure. The density of methane is .787 g/cm^3.
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