Thermodynamics pressure reaction question

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SUMMARY

The discussion centers on calculating thermodynamic properties for the reaction of 2.00 mol of SO2 with O2 at constant pressure, resulting in SO3 at 25 degrees Celsius. The constant pressure is set at 101 kPa, and the reaction releases 198 kJ of energy as heat. The key equations used include q = deltaH = -198 kJ and the relationship deltaH = delta U + delta(PV), where delta(PV) is expressed as RTdelta(n). The assumption of constant temperature at 25 degrees Celsius is critical for these calculations.

PREREQUISITES
  • Understanding of thermodynamic principles, specifically enthalpy and internal energy
  • Familiarity with the ideal gas law and its applications
  • Knowledge of reaction stoichiometry and molar calculations
  • Basic grasp of constant pressure processes in thermodynamics
NEXT STEPS
  • Study the derivation of the equation deltaH = delta U + delta(PV)
  • Learn about the implications of constant pressure and temperature in thermodynamic reactions
  • Explore the concept of delta(n) in relation to gas reactions
  • Investigate the relationship between heat transfer and work done in thermodynamic systems
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Chemistry students, chemical engineers, and professionals involved in thermodynamics and reaction engineering will benefit from this discussion.

thatoneguy6531
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So the question is: When 2.00 mol of SO2 reacts completely with 02 in a constant pressure reactor, the only material left in the reactor once the reaction has stopped is SO3 at 25 degrees celsius. The constant pressure in the reactor was 101kPa and 198 kJ of energy is released as heat. Assume Psys=Pext throughout the process. Calculate deltaH, deltaU, q and w per mole of O2 consumed for this reaction.

So I know q = deltaH = -198kJ since its a constant pressure process and I know to solve for deltaU I use:
deltaH = delta U + delta(PV) and in the solution apparently the delta(PV) = RTdelta(n). What I don't understand is why the temperature is assumed to be constant at 25 degrees celsius.
 
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thatoneguy6531 said:
What I don't understand is why the temperature is assumed to be constant at 25 degrees celsius.

Process doesn't have to adiabatic.
 

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