Calculating Initial Pressures in Rigid and Piston Containers with Monatomic Gas

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    Thermodynamics
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Homework Help Overview

The discussion revolves around calculating the initial pressures in two different containers holding a monatomic gas. One container is rigid, while the other features a piston that can move vertically. The problem involves understanding the effects of the piston and atmospheric pressure on the pressure calculations.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to calculate the pressure in the piston container using the weight of the piston and its area, while also considering atmospheric pressure. Some participants question the unit consistency in the calculations and ask for clarification on the original poster's approach.

Discussion Status

Participants are actively engaging with the problem, with one providing a formula for pressure that incorporates both the weight of the piston and atmospheric pressure. The original poster indicates they have arrived at an answer, suggesting some level of resolution, though the details of the calculations remain unclear.

Contextual Notes

There is a mention of potential unit issues in the calculations, which may affect the understanding of the problem. The original poster's initial assumptions about pressure may also be under scrutiny.

skinard360
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Two 800\; cm^3 containers hold identical amounts of a monatomic gas at 20^\circ C. Container A is rigid. Container B has a 100\; cm^2 piston with a mass of 10 kg that can slide up and down vertically without friction. Both containers are placed on identical heaters and heated for equal amounts of time.
What are the initial pressures in containers A and B?

I assumed that the net force was zero and used the equation
pressureB = [(weight of piston)/(area of piston)]+101,300

and I assumed that the pressure of the first piston was 101,300 Pa

but this was wrong, I'm not sure what else to do??
 
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Have you checked the units for (weight of piston) ?
Show us your calculation.
 
p = (w/A) + p(atmosphere)

p = (98/.01) + 101,300

the answer is in Pascals
 
ok...I got the answer...thanks :)
 

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