few easy questions , please If rGo < 0 for a reaction at all temperatures, then

Question

few easy questions , please

If rGo < 0 for a reaction at all temperatures, then rHo is ________________________ and rSo is ______________________________.

For a chemical reaction, if rG = 0, then K = _________, because the system is at ___________________________________.

Which of the following linear chain alcohols is likely to have the highest standard entropy in the liquid state?

a) CH3Cl

b) CH3CH2Cl

c) CH3CH2CH2Cl

d) CH3CH2CH2CH2Cl

e) CH3CH2CH2CH2CH2Cl

4.Calculate rG° for the reaction below at 25.0 C CS2(g) + 3 Cl2(g) S2Cl2(g) + CCl4(g)

given rH° = -231.1 kJ and rS° = -287.6 J/K.

5. Calculate rG° for the reaction below at 25.0 C.

Fe3O4(s) 3 Fe(s) + 2 O2(g)

Species   fH° (kJ/mol-rxn) S° (J/K·mol-rxn)

Fe3O4(s) -1118.4 146.4

Fe(s) 0 27.8

O2(g) 0 205.1

Explanation / Answer

1. DG0 = DH0-TDS0

If rGo < 0 for a reaction at all temperatures, then rHo is negative, and rSo is positive

2. For a chemical reaction, if rG0 = 0,

DG0 = -RTlnk

0 = -8.314*273.15lnk

k = 1

then K = 1 , because the system is at equilibrium.

3. e) CH3CH2CH2CH2CH2Cl

4. DG 0 = -231.1*10^3 - (298*-287.6)

      = -145.4 kj

5. DG0 = (1118.4*10^3)-(298*(2*205.1+3*27.8 - 146.4))

       = 1014.9 kj

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