Calculate the pressure-volume work for the given reaction

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SUMMARY

The discussion focuses on calculating pressure-volume work for a chemical reaction involving water (H2O) in its liquid state. Participants reference the ideal gas law (PV=nRT) but acknowledge its inapplicability due to the liquid state of water. The relevant formula for work is identified as dE=-P*dV, emphasizing the need for initial and final volumes of the mixture to proceed with calculations. The conversation highlights the importance of understanding the specific volumes involved in the reaction.

PREREQUISITES
  • Understanding of thermodynamics, specifically the concepts of pressure and volume.
  • Familiarity with the equation dE=-P*dV for calculating work.
  • Knowledge of the properties of liquids, particularly water (H2O).
  • Basic grasp of chemical reactions and stoichiometry.
NEXT STEPS
  • Research the implications of using the ideal gas law for non-ideal conditions.
  • Study the derivation and applications of the work formula dE=-P*dV.
  • Examine methods for determining the initial and final volumes in chemical reactions.
  • Explore the concept of phase changes and their impact on pressure-volume work calculations.
USEFUL FOR

Chemistry students, chemical engineers, and professionals involved in thermodynamic calculations and reaction analysis will benefit from this discussion.

anjauk2003
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New user has been reminded to always show their work on schoolwork problems.
Homework Statement
Assume that 2.00 moles of water are formed according to the following reaction at constant
pressure (101.3 kPa) and constant temperature (298 K):
I have to calculate the pressure-volume work for the given reaction and i really dont know how to start or what to use. Can someone help me?
Relevant Equations
2 H2(g) + O2(g) --> 2 H2O(l)
I dont have an solution Attempt. Maybe something with PV=nRT but this is for ideal gas and H2O is liquid. An other formula they introduced us to is: dE=-P*V
 
Last edited:
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anjauk2003 said:
dE=-P*V

If it is about work more like P*dV.

What is the initial volume of the mixture, and what is the final volume?
 
Borek said:
If it is about work more like P*dV.

What is the initial volume of the mixture, and what is the final volume?
That's the problem. I dont have more information. I wrote down everything i got.
 
You have everything you need. What is volume of water produced? What reacted?
 

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