Multiple Choice Question about Enthelpy of Formation

Click For Summary
SUMMARY

The standard enthalpy of formation for elements is defined as zero, which applies to their most stable forms at standard conditions. In the case of chlorine, Cl2(g) is the most stable form and thus has a standard enthalpy of formation of zero. The correct answer to the multiple-choice question regarding which form of chlorine has a zero standard enthalpy of formation is option d) Cl2(g). Other forms, such as Cl(g) and Cl-(aq), do not meet the criteria for standard state enthalpy of formation.

PREREQUISITES
  • Understanding of standard enthalpy of formation
  • Knowledge of chemical states of matter (gases, liquids, and aqueous solutions)
  • Familiarity with thermodynamic principles
  • Basic chemistry concepts regarding elements and their allotropes
NEXT STEPS
  • Study the definition and implications of standard state in thermodynamics
  • Learn about the enthalpy of formation for various elements and compounds
  • Explore the differences between various allotropes of elements
  • Review thermodynamic equations related to enthalpy changes
USEFUL FOR

Chemistry students, educators, and professionals in the field of thermodynamics or chemical engineering who are looking to deepen their understanding of enthalpy concepts and standard states.

TheExibo
Messages
55
Reaction score
1

Homework Statement



The term chlorine is used to mean a number of possible types of matter containing chlorine atoms, such as Cl2(g), Cl(g), and Cl-(aq). Which of these forms of chlorine would have a zero standard enthalpy of formation?

a) Cl2(g), Cl(g), and Cl-(aq)

b) Cl(g)

c) Cl-(aq)

d) Cl2(g)

e) Cl2(g), Cl(g)

Homework Equations



Enthalpy of Formation for Elements = 0KJ

The Attempt at a Solution



Really not sure where to begin, but the answer in the back of the book is d), and I can't understand why it's like that. Shouldn't it be a), since the enthalpy of formation for elements is always 0KJ
 
Physics news on Phys.org
Can you quote the definition of a standard state as was given to you?
 
What is the standard state of Chlorine? (Hint: standard state for pure liquids/gas is...)
 

Similar threads

Born-Haber Cycle: Formation of a Chlorine Atom
  • · Replies 2 ·
Replies
2
Views
2K
Chemistry Question about the Butler-Volmer equation in electrochemistry
  • · Replies 1 ·
Replies
1
Views
3K
Enthelpy of reaction calculation?
  • · Replies 6 ·
Replies
6
Views
14K
Standard reduction potential and half reactions
  • · Replies 2 ·
Replies
2
Views
6K
Enthalpy of Formation of Ammonia: Why is it Positive?
  • · Replies 10 ·
Replies
10
Views
3K
Standard enthelpy of formation of carbon gas
  • · Replies 1 ·
Replies
1
Views
6K
Hess's Law and Thermochemical Equations
  • · Replies 1 ·
Replies
1
Views
17K
Lewis structure and thermochemistry problems
  • · Replies 3 ·
Replies
3
Views
3K
Enthalpies of Formation from Methane & Oxygen
  • · Replies 1 ·
Replies
1
Views
10K
What is the standard enthelpy of formation of NaF
  • · Replies 1 ·
Replies
1
Views
8K