Calorimetry & Enthelpy: Effects on Temperature in an Insulated Chamber

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SUMMARY

The discussion centers on the endothermic reaction 2H2O(l) -> 2H2(g) + O2(g) with a ΔH of +571.5 kJ, conducted in an insulated chamber. The reaction absorbs heat from its surroundings, leading to a decrease in temperature within the chamber. The participants clarify that the system encompasses the reaction itself, while the surroundings include everything else within the insulated environment. This understanding confirms that a positive ΔH indicates heat absorption, resulting in a temperature drop.

PREREQUISITES
  • Understanding of thermodynamics, specifically enthalpy changes.
  • Familiarity with endothermic and exothermic reactions.
  • Knowledge of calorimetry principles.
  • Basic grasp of insulated systems in chemical reactions.
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  • Study the principles of calorimetry and its applications in chemical reactions.
  • Explore the concept of enthalpy and its calculations in thermodynamic processes.
  • Investigate the differences between endothermic and exothermic reactions in detail.
  • Learn about insulated systems and their impact on reaction dynamics.
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Chemistry students, educators, and professionals interested in thermodynamics and reaction energetics will benefit from this discussion.

madgab89
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Homework Statement


For the reaction 2H2O(l) -> 2H2(g)+O2(g) delta H = +571.5 kJ

If the reaction is carried out in an insulated chamber what effect would the reaction have on the temperature in the chamber? Why?

The attempt at a solution
I can't seem to get my head around this one. I know the sign on the enthalpy change is from the point of view of the system...but what really qualifies as the system and the surroundings if there is no real boundary between them?
 
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Wait...if I look at the equation
delta H=-CdeltaT

In order for delta H to be positive wouldn't temperature change have to be negative?
 
A positive ΔH indicates that the reaction is endothermic; the reaction requires the absorption of heat in order to proceed. So, you are correct. The temperature will decrease because the reaction absorbs heat from its surroundings.
 

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