Selected Standard Heats of Formation at 25°C (298 K) Formula AHG (k]/mol) Calcium Ca(s) CaO(s) CACO,(s) Carbon -635.1 - 1206.9 C(graphite) C(diamond) CO(g) CO2(g) CH4(g) CH,OH(/) HCN(g) CS-(1) Chlorine 1.9 -110.5 -393.5 -74.9 -238.6 135 87.9 C(g) 121.0 HCI(g) Hydrogen H(g) -92.3 218.0 H2(g) Nitrogen N2(g) NH3(g) NO(g) Oxygen O;(g) Os(g) H;O(g) H,0() Silver Ag(s) ABCI(s) Sodium -45.9 90.3 143 -241.8 -285.8 - 127.0 Na(s) Na(g) NaCI(s) 107.8 -411.1 Sulfur Sg(rhombic) S,(monoclinic) SO-(g) SO,(8) 0.3 - 296.8 - 396.0

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Calculate H0rxn for each of the following using data from Appendix B.

(a) 2 H2S(g) + 3 O2(g) 2 SO2(g) + 2 H2O(g)

(b) C2H6(g) + O2(g) CO2(g) + H2O(g) [unbalanced](kJ)
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HWCH06 - CHEM 211F21, Fall 2021| WebAssign
6-3tab.gif 288×902 pixels
Selected Standard Heats of
Formation at 25°C (298 K)
Formula
AH? (kJ/mol)
Calcium
Ca(s)
CaO(s)
CACO3(s)
Carbon
-635.1
- 1206.9
C(graphite)
C(diamond)
CO(g)
CO2(g)
CH4(8)
CH3OH(1)
HCN(g)
CS2()
1.9
-110.5
- 393.5
-74.9
-238.6
135
87.9
Chlorine
121.0
CI(g)
Cl2(g)
HCI(g)
Hydrogen
H(g)
H2(g)
Nitrogen
N2(g)
NH3(g)
NO(3)
Oxygen
O2(8)
O3(g)
H20(g)
H2O(1)
Silver
-92.3
218.0
-45.9
90.3
143
-241.8
- 285.8
Ag(s)
AGCI(s)
Sodium
- 127.0
Na(s)
Na(g)
NaCI(s)
Sulfur
107.8
-411.1
Sg(rhombic)
Ss(monoclinic)
SO-(g)
SO3(8)
0.3
- 296.8
- 396.0
Transcribed Image Text:O < > webassign.net + O HWCH06 - CHEM 211F21, Fall 2021| WebAssign 6-3tab.gif 288×902 pixels Selected Standard Heats of Formation at 25°C (298 K) Formula AH? (kJ/mol) Calcium Ca(s) CaO(s) CACO3(s) Carbon -635.1 - 1206.9 C(graphite) C(diamond) CO(g) CO2(g) CH4(8) CH3OH(1) HCN(g) CS2() 1.9 -110.5 - 393.5 -74.9 -238.6 135 87.9 Chlorine 121.0 CI(g) Cl2(g) HCI(g) Hydrogen H(g) H2(g) Nitrogen N2(g) NH3(g) NO(3) Oxygen O2(8) O3(g) H20(g) H2O(1) Silver -92.3 218.0 -45.9 90.3 143 -241.8 - 285.8 Ag(s) AGCI(s) Sodium - 127.0 Na(s) Na(g) NaCI(s) Sulfur 107.8 -411.1 Sg(rhombic) Ss(monoclinic) SO-(g) SO3(8) 0.3 - 296.8 - 396.0
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