Ideal Gas Law Problem: Finding Pressure with Temperature Change and Fixed Mass

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Homework Help Overview

The discussion revolves around applying the Ideal Gas Law to determine the pressure of a gas when its temperature changes, while the volume remains constant. The original poster expresses uncertainty about completing the equation due to perceived missing information.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between pressure, volume, and temperature, questioning how to handle the fixed mass of gas and the unknown variable 'n'. There are inquiries about the necessity of finding the volume and how it relates to the overall problem.

Discussion Status

The conversation is ongoing, with participants exploring the implications of fixed variables and the relationships defined by the Ideal Gas Law. Some guidance has been offered regarding the constants in the equation, but no consensus or resolution has been reached.

Contextual Notes

Participants note the constraints of the problem, including the fixed mass of gas and the assumption that the volume does not change, which may influence their approach to finding the solution.

TaraaaK
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does anyone know how to do this question. it feels like there's a part of the question missing as i don't know how to complete the equation

The pressure of a fixed mass of gas in a sealed sphere is measured to be 1.02 x 10^5 Pa at a temperature of 253K. Assuming the volume of the sphere doesn't change calculate the pressure within the sphere if the temperature is increased to 281K
(universal gas constant R =8314 J/K/mol

because it's a fixed mass of gas do i ignore n? when doing the equation

Homework Equations


PV=nRT

The Attempt at a Solution


(1.02 x 10^5) V = n (8314)(253)
1.02 x 10^5 V = 2103442n
 
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TaraaaK said:
i don't know how to complete the equation
What equation are you trying to complete?
 
the first part first of all,but there are two unknown variables so I'm not sure what to do
 
i know i need to find the volume of the sphere for the first part but iam unsure of how to get a number for n
 
How are you going to use the volume of the sphere once you get it?
 
when i have the volume i will use it to find the pressure like so

P = (n(8314)(281)) / V
 
TaraaaK said:
when i have the volume i will use it to find the pressure like so
P = (n(8314)(281)) / V
TaraaaK said:
unsure of how to get a number for n
So, what all has changed besides temperature and pressure?
 
nothing
 
Correct.
TaraaaK said:
fixed mass of gas
TaraaaK said:
volume of the sphere doesn't change
Just because the equation uses two variables, does not mean you have to find values for both if they're both constant, and you're interested in solving for the value of some other variable.
 
  • #10
Thank you so much
:)
 

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