Question

Please, I need help with my homework! Consider the reaction 2CO2(g) + 5H2(g)=C2H2(g) + 4H2O(g) for...

Please, I need help with my homework!

Consider the reaction

2CO2(g) + 5H2(g)=C2H2(g) + 4H2O(g)

for which ΔH° = 46.50 kJ and ΔS° = -124.8 J/K at 298.15 K.

(1) Calculate the entropy change of the UNIVERSE when 2.230 moles of CO2(g) react under standard conditions at 298.15 K.

ΔSuniverse _________ =  J/K


(2) Is this reaction reactant or product favored under standard conditions?

_________



(3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction is reactant favored, choose 'reactant favored'.

_________​

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Answer #1

(1) Suniverse = -313.0 J/K

(2) Is this reaction reactant or product favored under standard conditions? : Reactant favored

(3) Reactant favored

Explanation

Ssys = (So) * (moles CO2)

Ssys = (-124.8 J/K / 2 mol CO2) * (2.230 mol CO2)

Ssys = -139.152 J/K

Hosys = 46.50 x 103 J

Hosurr = -(Hosys)

Hosurr = -(46.50 x 103 J)

Hosurr = -46.50 x 103 J

Hsurr = (Hosurr) * (moles CO2)

Hsurr = (-46.50 x 103 J / 2 mol CO2) * (2.230 mol CO2)

Hsurr = -51847.5 J

Ssurr = (Hsurr) / (T)

Ssurr = (-51847.5 J) / (298.15 K)

Ssurr = -173.90 J/K

Suniverse = Ssys + Ssurr

Suniverse = (-139.152 J/K) + (-173.90 J/K)

Suniverse = -313.0 J/K

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