1LoT, heat needed to raise the temperature of oxygen.

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SUMMARY

The discussion centers on calculating the heat required to raise the temperature of 1.50 g of oxygen at a pressure of 9.00 atm by 108°C using the specific heat capacity (C_p) of oxygen, which is 29.2 J/(mol·°C). The participant initially calculated the heat (Q) to be 295.65 J but received feedback indicating the correct answer is 148 J. This discrepancy suggests a potential error in the calculation process, possibly related to the number of moles or the application of the specific heat formula. The participant seeks clarification to avoid future mistakes and to potentially contest their grade.

PREREQUISITES
  • Understanding of the Ideal Gas Law and its applications
  • Knowledge of specific heat capacity and its role in thermodynamics
  • Ability to perform mole conversions using molecular weights
  • Familiarity with the formula Q=n * C_p * delta T for isobaric processes
NEXT STEPS
  • Review the Ideal Gas Law and its implications for heat calculations
  • Study the concept of specific heat capacity in detail
  • Practice mole conversion calculations with different gases
  • Learn how to use LaTeX for formatting equations in academic discussions
USEFUL FOR

Students studying thermodynamics, chemistry enthusiasts, and educators looking to clarify heat transfer calculations in isobaric processes.

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Homework Statement


A container holds 1.50 g of oxygen at a pressure of 9.00 atm.

How much heat is required to increase the temperature by 108^\circ C at constant pressure?

C_p (specific heat of oxygen for an Isobaric process) = 29.2


Homework Equations



1LoT for Isobaric process.
Q=n * C_p * delta T



The Attempt at a Solution



So, plugging things in, with 1.5/16 to get the mols, got me to 295.65J. Plugging this into the online homework system gave me a 'WRONG'. So trying different degrees for different sigfigs and rounding gave me nothing. So finally, it just gave me the answer... which was 148J, or almost exactly half of my calculations.

So this leaves me with one of two issues. Either I plainly forgot something which was a divide by two, or the answer is half of what it should be. I want to know if I missed something big for two reasons:
A. So I don't do it again.
B. In case I am right, I can challenge my grade on this.

On a side note, I haven't been here for a long time, so what is used these days to put in equations in the 'pretty format'. Is it still LaTex of something like that?
 
Physics news on Phys.org
While converting into mol, consider one molecule of oxygen, and its molecular weight is 32.
 

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