Why is This Reaction Endothermic?

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Discussion Overview

The discussion revolves around the thermodynamic nature of a chemical reaction involving carbon, water vapor, carbon monoxide, and hydrogen. Participants explore whether the reaction is exothermic or endothermic, particularly in the context of temperature changes and equilibrium principles.

Discussion Character

  • Homework-related
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant initially suggests the reaction is exothermic, arguing that increasing temperature should favor the production of products, implying heat is a product.
  • Another participant questions the initial claim, indicating that if products increase with temperature, the reaction must be endothermic, treating energy as a reactant.
  • A later reply states that adding hydrogen shifts the reaction to the right, which could imply more product formation.
  • Further contributions clarify that an increase in temperature leads the system to produce more CO to counteract the temperature rise, suggesting an endothermic nature.

Areas of Agreement / Disagreement

Participants express differing views on whether the reaction is exothermic or endothermic, with some supporting the endothermic perspective based on temperature effects and equilibrium shifts, while others initially propose exothermic reasoning. The discussion remains unresolved with multiple competing views.

Contextual Notes

Participants reference Le Chatelier's principle to support their arguments, but the discussion does not resolve the underlying assumptions about the reaction's thermodynamic properties or the specific conditions affecting equilibrium.

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Homework Statement


At 1500 ° C , CO is formed more than at 1000 ° C. Is the reaction from left to right exothermic or endothermic?

Homework Equations



C(s) + H2O ↔CO(g) + H2[/B]

The Attempt at a Solution


I think its Exothermic reaction . The temperature is increased from 1000°C to 1500 °C . If heat increases the CO + H2 (products) shall produced more. Heat is a product in a exothermic reaction .So
C(s) + H2 ↔CO(g) + H2 +x KJ
But correct answer seems to be endothermic. I don't know why?
[/B]
 
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If the system is initially at equilibrium then you add more water vapor, in which direction do you expect the reaction to go? Similarly, if the system is initially at equilibrium then you add more hydrogen gas, in which direction do you expect the reaction to go?
 
If you add hydrogen , the reaction shifts to the right
 
If the products increase when the temperature is increased, then the reaction has to be endothermic. The energy could then be looked at as a reactant and when you increase the reactants, the system has to shift to making more product to compensate- therefore the system would create more CO at higher temperatures.
 
In an equilibrium reaction the system always tries to counter the change introduced. In this reaction the temperature increases so the system tries to decrease the temperature by increasing the production of CO. So the forward reaction decreases the surrounding temperature meaning it is an endothermic reaction.
 

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