For which of the following reactions the change in enthalpies is equal to the change in internal energy:
Correct answer: A. H2 + l2 ➞ 2HI
- A. H2 + l2 ➞ 2HI
- B. 2H2O2➞2H2O+O2
- C. PCI5 ➞ PCI3+Cl2
- D. C+O2 ➞ CO2
Explanation
The change in enthalpy is equal to the change in internal energy for reaction 1, H2 + I2 ➞ 2HI as ∆ n = 0
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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