Table 6.3 Selected Standard Enthalpies of Fomation at 25°C (298 K) Formula AH; (kJ/mol) Calcium Ca(s) CaO(s) -635.1 CaCO;(s) Carbon - 1206.9 C(graphite) C(diamond) CO(g) CO-(g) CH,(g) CH,OH(1) HCN(g) CS,() Chlorine Cl(g) Cl,(g) HČI(g) Hydrogen H(g) H,(g) Nitrogen N2(g) NH3(g) NO(g) Охудen 0,(g) 0,(g) H,O(g) H,O(1) Silver Ag(s) AGCI(s) 1.9 -110.5 -393.5 -74.9 -238.6 135 87.9 121.0 -92.3 218.0 -45.9 90.3 143 -241.8 -285.8 -127.0 Sodium Na(s) Na(g) NaCl(s) 107.8 -411.1 Sulfur S(rhombic) Sg(monoclinic) SO,(g) SO-(g) 0.3 - 296.8 -396.0 ΔΗΣηΔΗ; αντι ΣηΔΗ?ο. (6.9) (reactants) where E means “sum of," and m and n are the amounts (mol) of the products and reactants given by the coefficients in the balanced equation.

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Problem Nitric acid is used to make many products, including fertilizers, dyes, and explosives. The first step in its production is the oxidation of ammonia:
                                4NH3(g) + 5O2(g) → 4NO(g) 1 6H2O(g)
Calculate ΔH°rxn from ΔH°f values.
Plan We use values from as shown (or Appendix B) and apply as shown.

Table 6.3 Selected Standard
Enthalpies of Fomation
at 25°C (298 K)
Formula
AH; (kJ/mol)
Calcium
Ca(s)
CaO(s)
-635.1
CaCO;(s)
Carbon
- 1206.9
C(graphite)
C(diamond)
CO(g)
CO-(g)
CH,(g)
CH,OH(1)
HCN(g)
CS,()
Chlorine
Cl(g)
Cl,(g)
HČI(g)
Hydrogen
H(g)
H,(g)
Nitrogen
N2(g)
NH3(g)
NO(g)
Охудen
0,(g)
0,(g)
H,O(g)
H,O(1)
Silver
Ag(s)
AGCI(s)
1.9
-110.5
-393.5
-74.9
-238.6
135
87.9
121.0
-92.3
218.0
-45.9
90.3
143
-241.8
-285.8
-127.0
Sodium
Na(s)
Na(g)
NaCl(s)
107.8
-411.1
Sulfur
S(rhombic)
Sg(monoclinic)
SO,(g)
SO-(g)
0.3
- 296.8
-396.0
Transcribed Image Text:Table 6.3 Selected Standard Enthalpies of Fomation at 25°C (298 K) Formula AH; (kJ/mol) Calcium Ca(s) CaO(s) -635.1 CaCO;(s) Carbon - 1206.9 C(graphite) C(diamond) CO(g) CO-(g) CH,(g) CH,OH(1) HCN(g) CS,() Chlorine Cl(g) Cl,(g) HČI(g) Hydrogen H(g) H,(g) Nitrogen N2(g) NH3(g) NO(g) Охудen 0,(g) 0,(g) H,O(g) H,O(1) Silver Ag(s) AGCI(s) 1.9 -110.5 -393.5 -74.9 -238.6 135 87.9 121.0 -92.3 218.0 -45.9 90.3 143 -241.8 -285.8 -127.0 Sodium Na(s) Na(g) NaCl(s) 107.8 -411.1 Sulfur S(rhombic) Sg(monoclinic) SO,(g) SO-(g) 0.3 - 296.8 -396.0
ΔΗΣηΔΗ; αντι ΣηΔΗ?ο.
(6.9)
(reactants)
where E means “sum of," and m and n are the amounts (mol) of the products and
reactants given by the coefficients in the balanced equation.
Transcribed Image Text:ΔΗΣηΔΗ; αντι ΣηΔΗ?ο. (6.9) (reactants) where E means “sum of," and m and n are the amounts (mol) of the products and reactants given by the coefficients in the balanced equation.
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