How Do I Solve for Final Pressure in an Ideal Gas Problem?

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Homework Help Overview

The discussion revolves around an ideal gas problem involving changes in temperature and volume, specifically focusing on calculating the final pressure after these changes. The context includes initial conditions of pressure and temperature, as well as the relationship between these variables in the ideal gas law.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formulas available for ideal gas problems, questioning their applicability to scenarios involving changes in temperature and volume. There is an exploration of how to set up equations based on initial and final states of the gas.

Discussion Status

Some participants have suggested writing out the ideal gas law for both initial and final states to derive the final pressure. Others have proposed creating two equations to facilitate solving for the unknowns, indicating a productive direction in the discussion.

Contextual Notes

There is mention of missing information regarding the number of moles of gas and the universal gas constant, which may affect the approach to solving the problem. Participants are navigating the constraints of the problem setup and the formulas provided.

dnl65078
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Please Help! Kinetic Energy Problem

1. The initial pressure in an ideal gas is 1.40 atm when its temperature is 299 K. The temperature is increased to 315 K and the volume is increased to 1.29 times its initial value. Calculate the final pressure.

2. R = 8.31 J/molK

PLEASE HELP!

THANKS IN ADVANCE!
 
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What have you tried already?
 


Thats just the thing. I cannot figure out what formula to use. The formula's I have are PV=nRT and PV=NKbT... none of the formulas I was given seem to be valid for a "change in temp/volume"
 


Try writing out PV=nRT for both the "before" and "after" situations. You'll be able to solve for the final pressure from there, even though you don't know n (and don't need to know R).
 


Make 2 equations and solve by dividing the equations. Cancel out the same unknown.
 

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