Just do number 1 please. Thanks and show all work Name Homework 14 1. The follow

Question

Just do number 1 please. Thanks and show all work

Name Homework 14 1. The following figure shows the plots of AH and TAS for a phase change as a function of temperature. a) What is the status of the process at the point where the two lines intersect? b) over what temperature range is this process spontaneous? Temperature (C) c) Of the six phase changes melting, vaporization, condensation, freezing, sublimation, and deposition which ones have thermodynamic profiles that fit the pattern in the figure? 2. Gaseous ammonia may be produced by the Haber process: N2(g) 3H20g) 2NH3(g) For this reaction at 298 K, AH 91.8 kJ/mol and AS 198.1 J/mol-K. a) Find AG for this reaction at 298 K. Is the reaction spontaneous under standard conditions at 298 K?

Explanation / Answer

Q1.

a)

status of the process when lines intersect:

dH = T*dS

this must be in EQUILIBRIUM

since

dG = dH - T*dS = 0

so

dG = 0, therefore the reaciton has achieved equilibrium

B)

find T when it is

dG < dH - T*dS

dH < T*dS

whenever dH is less than T*dS, then this is spontaneous

so

in the list,

T must be lower than 60°C

c)

note that enthalpy change does not changes as T changes...

Note that as we increase T, this becomes each time less favourable, so this must be an exothermic process so:

- fusion / condensation / deposition

Due to the entropy change, ignore gas

so this is most liley fussion

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