How Does CO2 Volume Change When Released to Ambient Air?

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    Co2 Expansion
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Homework Help Overview

The discussion revolves around the behavior of carbon dioxide (CO2) when it is released from a pressurized state to ambient air. Participants are exploring the relationship between pressure, volume, and temperature in the context of gas laws.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster seeks a formula to calculate the volume change of CO2 when released from a specific pressure. Some participants reference the ideal gas law and discuss the relationship between pressure, volume, and temperature, while others clarify the definition of variables involved.

Discussion Status

The discussion is active, with participants providing insights into the gas laws and clarifying concepts related to moles and molar mass. There is a focus on understanding the implications of the ideal gas law in this scenario, but no consensus has been reached regarding a specific solution.

Contextual Notes

Participants are working under the assumption of standard conditions for temperature and pressure, and there is some confusion regarding the definition of the number of moles in relation to the mass of CO2.

dsignguy
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I need a formula to figure out the expansion of CO2.
Ex: if I'm at sea level, "room temp", I've got 1cubic foot of CO2 at 120psi, What is the volume when its released to ambient air ?

Can anyone help?

Shawn
 
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Any gas follows a law P V = n R T where P = pressure (pascals) V = volume (m^3), n is the number of moles (44g for CO2), R is a constant 8.3145 J/(mol K) and T is the absolute (kelvin ) temperature.

Alternatively 44g of CO2 occupies 24litres at room temmp/pressure. The volume decreases linearly with pressure and increases linearly with absolute temperature.
 
mgb_phys said:
n is the number of moles (44g for CO2)
That's a little confusing. To clarify, n is not 44g (which is the value of the molar mass).
 
Sorry, yes to make it clearer. n is the number of moles, each mole of CO2 weighs 44g.

But you can work it all out from just knowing that P * V is constant so long as temperature doesn't change.
 

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