Question

General Chemistry 11 5. Consider the expansion of an ideal gas against the atmosphere. Briefly explain each of your answers below. (2 pts) a) Is AG zero, positive, or negative? b) Is AG zero, positive, or negative? c) Is the work zero, positive, or negative? d) If the expansion is done so that the temperature doesn't change, is the energy transferred as heat (9) zero, positive, or negative? 6. You can estimate atmospheric pressure at various altitudes using P = Poe (0.00012, where Po is the atmospheric pressure at sea level and h is the altitude in question in meters. Calculate the boiling point of water in Denver (1500 m high) (Extra credit 1 pt) HINT: If P. is 1 atm, then Patm = 0.83 at 1500 meters using the formula given.

Answer 1

a. As the gas expands freely, the process is spontaneous and thus the change in Gibbs's free energy is negative.

b. The standard state Gibbs's free energy is also negative as the reaction is spontaneous in all cases.

c. Work done is positive here as the work is done by the system on the surroundings.

d. For answer to question d, I'm attaching an image. The change in heat is positive and the reason is given in the image.

If the temperature a reaction, it means that and the work done expansion of an ideal does not change dwing the reaction is esoth in an isothermal gas is given of w = nRT en V2 Vi where = final volume W = Initial volume = no. of moles of AS Expansion in occaving we 2)~, so w = tve. From know gas. say of that here, 1st law of thermodynamics, we that dq = dut due / aq= au + 8w. du = o for an ideal gas, so, dq = change in heat = change in on work done is positive. work

E. For the answer I'm attaching an image

where Griven is the formula to estimate pressure at various attitudes is P = Poe - 10.00012)th Po= is the pressure at sea level which is equal to 1 atm. a altitude of the desired place = 1500 l Denver, as asked) substituting the given values in the Equation n 1500 D P = Poxen 1o.00012) xh we - (0.00012)x1500 . Denver & lxe = 0.835 Comower)