What Is the Final Temperature of a Mixture of Oxygen and Air?

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SUMMARY

The final temperature of a mixture of oxygen at 105 K and room air at 307 K, mixed at equal mass flow rates, is calculated using the specific heat capacities of both substances. The correct formula is Q=mcΔT, where the heat transfer is equal for both components. The resulting temperature of the mixture is determined to be approximately 210 K, based on the equation (105 x 918 + 307 x 1012) / (918 + 1012). This calculation confirms the validity of the approach taken in the discussion.

PREREQUISITES
  • Understanding of thermodynamics principles, specifically heat transfer.
  • Familiarity with specific heat capacity concepts.
  • Knowledge of the equation Q=mcΔT for calculating heat transfer.
  • Basic algebra skills for solving equations.
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  • Study the principles of heat transfer in thermodynamics.
  • Learn about specific heat capacities of various gases.
  • Explore advanced thermodynamic equations and their applications.
  • Practice problems involving mixtures of different substances and their thermal properties.
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Students studying thermodynamics, educators teaching heat transfer concepts, and professionals working in fields requiring thermal analysis and calculations.

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Homework Statement



An oxygen supply system mixes oxygen at 105 K and room air at 307 K at equal mass flow rates. What is the temperature of the resulting mixture in K? (c of oxygen = 918 J/kgK, c of air = 1012 J/kgK)

Homework Equations



[tex]Q=mc\Delta T[/tex] and [tex]Q=mL_f[/tex]

The Attempt at a Solution



(105 x 918 + 1012 x 307) / (918 + 1012) = 210 K ( not a single inkling about the validity of the answer ) -_- . The inadequancy of my lecture notes really leaves me clueless =/
 
Last edited:
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firstly, we must define delta T clearly. delta T is the change in temperature of both mixtures, and we can define delta T as the temepreature change from 105K, and then the temperature change for the room air is (307-105)=202K, 202-deltaTK.

Equate both equations together in the first equation you gave and you have the answer.
 

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