How Does CO2 Volume Change When Released to Ambient Air?

In summary, to figure out the expansion of CO2, you can use the formula P V = n R T where P is pressure, V is volume, n is the number of moles (44g for CO2), R is a constant, and T is the absolute temperature. Alternatively, 44g of CO2 occupies 24 litres at room temperature and pressure, and the volume decreases with pressure and increases with temperature. Just remember that n is not equal to 44g, but rather the number of moles (each weighing 44g). This formula can be used as long as the temperature remains constant.
  • #1
dsignguy
1
0
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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  • #2
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.
 
  • #3
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).
 
  • #4
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.
 

FAQ: How Does CO2 Volume Change When Released to Ambient Air?

What is the formula for calculating CO2 expansion rate?

The formula for calculating CO2 expansion rate is: (Initial volume of CO2) x (Final temperature of CO2) / (Initial temperature of CO2) = Final volume of CO2.

How does temperature affect the expansion rate of CO2?

Temperature plays a crucial role in the expansion rate of CO2. As the temperature of CO2 increases, the molecules gain more energy and move faster, causing them to occupy more space and expand. On the other hand, as the temperature decreases, the molecules slow down and occupy less space, resulting in a decrease in expansion rate.

What units are used for measuring CO2 expansion rate?

CO2 expansion rate is typically measured in units of volume, such as liters (L) or cubic meters (m^3). The temperature is measured in degrees Celsius (°C) or Kelvin (K).

What are some factors that can affect the accuracy of CO2 expansion rate calculations?

Some factors that can affect the accuracy of CO2 expansion rate calculations include variations in temperature, pressure, and the initial volume of CO2. Additionally, the presence of impurities or other gases in the CO2 can also impact the expansion rate.

Is there a specific method or tool for calculating CO2 expansion rate?

Yes, there are various methods and tools available for calculating CO2 expansion rate, such as the ideal gas law equation and online calculators. It is important to ensure that the chosen method or tool is appropriate for the specific conditions and parameters of the CO2 being measured.

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