Compound ∆Hf (kJ/mole) ∆S (J/mole K) CO2(g) –393.5 +213.8 CO2 (aq) –413.8 +117.6 N2O4 9.16 +304.4 NO2 33.2 240.1 CaCO3 –1207.6 91.7 CaO –634.9 +38.1 I2 (g) 62.42 260.69 HI(g) 26.5 206.6 H2 (g) 0 130.7 (a) For the following reactions, using the provided ∆H and ∆S data, determine whether each one would be spontaneous or nonspontaneous at 25°C CO2(g)   à CO2(aq)       N2O4(g)-------- à2 NO2(g)       CaCO3(s) ----à CaO (s)  + CO2(g)       H2 (g) + I2(g)---- à 2 HI (g)

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Compound

∆Hf (kJ/mole)

∆S (J/mole K)

CO2(g)

–393.5

+213.8

CO2 (aq)

–413.8

+117.6

N2O4

9.16

+304.4

NO2

33.2

240.1

CaCO3

–1207.6

91.7

CaO

–634.9

+38.1

I2 (g)

62.42

260.69

HI(g)

26.5

206.6

H2 (g)

0

130.7

  1. (a) For the following reactions, using the provided ∆H and ∆S data, determine

whether each one would be spontaneous or nonspontaneous at 25°C CO2(g)   à CO2(aq)

 

 

 

N2O4(g)-------- à2 NO2(g)

 

 

 

CaCO3(s) ----à CaO (s)  + CO2(g)

 

 

 

H2 (g) + I2(g)---- à 2 HI (g)

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