Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Hello i need help with these two blanks
Transcribed Image Text:• Formation equations make 1 mol of a compound
from its elements and define formation AH, :
AH°, kJ/mol
Calcium
+T 6.5 Cat)
0.
CaO(s)
-635.1
(C(graphite) + 2H,(g) → CH4(g) AH = -74.9 kJ/mol
Na(s) +2 Cl2(g) → NaCI(s) AH;°
CACO,()
Carbon
Cigraphite)-
C(diamond)
CO(g)
CO,(g)
CH(g)
CH,OH()
HCN(g)
CSt)
Chlorine
Cl(g)
C1,(g)
HCKB)
Hydrogen
H(g)
H(g)
Nitrogen
N(g)
NH,(g)
NO(g)
Oxygen
-1206.9
%3D
0.
= -411.1 kJ/mol
1.9
-110.5
-393.5
-74.9
-238.6
135
87.9
C;H;OH(I) AH,°= -277.6 kJ/mol
For an element in its standard state, AH,° =0
Less stable allotropes have positive AH,:
...
%3D
121.0
0.
-92.3
C(graphite) C(diamond)
/2
Cl,(g) → Cl•(g)
AH° = 1.9 kJ/mol
AH;
AH,° = 143.0 kJ/mol
%3D
218.0
0.
121.0 kJ/mol
%3D
0.
(3/2)02→03(g)
S8(rhombic) → Sg(monolcinic) AH = 0.3 kJ/mol
-45.9
90.3
%3D
%3D
0.
143
-241.8
... Most compounds have AH,° < 0: (lower Eh)
Ca(s)tClaaphite)+ 3/2.0la)
H,O(g)
H,O()
Silver
-285.8
Ag(s)
AgC(s)
Sodium
Nats)
Na(g)
NaCl(s)
0.
→ CaCO3(s)
→ CS2(1)
-127.0
0.
107.8
-411.1
I Halg)+lgraphitetENica)
→ HCN(g)
→ Al,O3(s)
Sulfur
S,(rhombie)
S,(monoclinic)
0.
0.3
(3os
(aos
-296.8
-396.0
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