question 3 THURSDAY, APRIL 5\", 2018 Answer all questions correctly in ink in th

Question

question 3

THURSDAY, APRIL 5", 2018 Answer all questions correctly in ink in the examination booklet (10 pts each) a) boiling water b)N,0s2NO,(uO) shuffling a deck of cards 1) Indicate the sign of the change in entropy for each of the following processes: 2) Is the following reaction spontaneous at 25°C under standard conditions? 3) 1s the reaction 2 NH,+ CO, NH.CONH, + Ho aG136 k) spontancous at 25'c if P-0.08 atm, Pc 0.3 atm, and [NH,CONH,]-1.8 M? 4) At what temperature will the following reaction reverse direction? NH,CI NH,+C

Explanation / Answer

3. For the given reaction,

pNH3 = 0.08 atm

pCO2 = 0.3 atm

[NH2CONH2] = 1.8 M

So,

Q = [NH2CONH2]/[NH3]^2/[CO2]

   = (1.8)/(0.08)^2.(0.3)

   = 937.5

Using,

dGo = dGo + RTlnQ

dGo = -13.6 kJ = -13600 J

R = gas constant

T = 25 oC + 273 = 298 K

feeding the values,

dG = -13600 + 8.314 x 298 ln(937.5)

      = 3354.6 J

      = 3.35 kJ

As the dG for the reaction is +ve, the reaction is non-spontaneous at the given concentration and pressures.

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