Standard Enthalpy of Formation and Hess's Law 15. Consider the following data: ΔΗ° (kJ) -62.8 -635.5 -653.1 C₂H₂(g) + 5/2 O2(g) → 2CO₂(g) + H₂O() -1300 C(graphite) + O2(g) → CO₂(g) -393.51 Ca(s) + 2C(graphite) → CaC₂(s) Ca(s) + 1/2O₂(g) → Cao(s) CaO(s) + H₂O() →→→ Ca(OH)₂(aq) 35.5.6.1 1264 101 1000 Use Hess' law to find the change in enthalpy at 25°C for the following equation: CaC₂(s) + 2H₂O(1)→ Ca(OH)₂(aq) + C₂H₂(g)
Standard Enthalpy of Formation and Hess's Law 15. Consider the following data: ΔΗ° (kJ) -62.8 -635.5 -653.1 C₂H₂(g) + 5/2 O2(g) → 2CO₂(g) + H₂O() -1300 C(graphite) + O2(g) → CO₂(g) -393.51 Ca(s) + 2C(graphite) → CaC₂(s) Ca(s) + 1/2O₂(g) → Cao(s) CaO(s) + H₂O() →→→ Ca(OH)₂(aq) 35.5.6.1 1264 101 1000 Use Hess' law to find the change in enthalpy at 25°C for the following equation: CaC₂(s) + 2H₂O(1)→ Ca(OH)₂(aq) + C₂H₂(g)
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter15: Energy And Chemical Change
Section: Chapter Questions
Problem 92A
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Transcribed Image Text:Standard Enthalpy of Formation and Hess's Law
15. Consider the following data:
Ca(s) + 2C(graphite) → CaC₂(s)
Ca(s) + 1/2O₂(g) →→ CaO(s)
CaO(s) + H₂O(1)→→ Ca(OH)₂(aq)
p
C₂H₂(g) + 5/2 O2(g) → 2CO₂(g) + H₂O(1)
C(graphite) + O₂(g) → CO₂(g)
ΔΗ° (kJ)
-62.8
-635.5
-653.1
-1300
-393.51
K-HA
022+
21000
Use Hess' law to find the change in enthalpy at 25°C for the following equation:
CaC₂(s) + 2H₂O(1)→ Ca(OH)₂(aq) + C₂H₂(g)
141813
116
Toml
Jom!
Expert Solution
Step 1
Hess's law describes that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
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