What Gas Is in the Container Based on Specific Heat Values?

  • Thread starter Thread starter mikeee
  • Start date Start date
  • Tags Tags
    Thermodynamics
AI Thread Summary
To determine the unknown gas in the container, the heat capacities at constant pressure (cp = 907.8 J) and constant volume (cv = 648.4 J) are essential. The ratio of these values, gamma (γ = cp/cv), can help identify the type of gas, whether monatomic or diatomic. Ideal gas behavior indicates that monatomic gases like Helium and Argon, and diatomic gases like Nitrogen and Oxygen, have distinct heat capacity ratios. The relationship cp = cv + R, derived from Mayer's equation, is also relevant for calculations. This information provides a solid foundation for identifying the gas based on its heat capacity characteristics.
mikeee
Messages
12
Reaction score
0
Need help!

Ok, I'm having problems with the following question:

A container is filled with an unknown gas. To heat 1 kg of the gas by one degree under the constant pressure one needs 907.8 J, while the same increase of temperature of the gas when the colume is kept constant, needs 648.4 J.

Determine what gas is in the container.


-- if you guys can help point me in the right direction i'd appreciated it!
 
Last edited:
Science news on Phys.org
Well let's see. The 907.8J is related to heat capacity at constant pressure and the 648.4J is related the heat capacity at constant volume. In your Thermo book, since this is a gas, you should see a relation for an ideal gas that states gamma = cp/cv. Depending on this ratio, you can calculate if the gas is monatomic, diatomic, etc... In my book, this is discussed right after Mayer's equation cp = cv + R. Now, there are multiple examples of real world monatomic and diatomic gases. I believe Helium and Argon follow the monatomic model reasonably well, whereas Nitrogen and Oxygen follow the diatomic model well.

Is this enough info to get you started?
 
yep, thanks for your reply
 

Thread 'Condensate rate of water for an air conditioning cooling coil'

I need to calculate the amount of water condensed from a DX cooling coil per hour given the size of the expansion coil (the total condensing surface area), the incoming air temperature, the amount of air flow from the fan, the BTU capacity of the compressor and the incoming air humidity. There are lots of condenser calculators around but they all need the air flow and incoming and outgoing humidity and then give a total volume of condensed water but I need more than that. The size of the...
View full post »

Thread 'Entropy and configurations of microstates'

I was watching a Khan Academy video on entropy called: Reconciling thermodynamic and state definitions of entropy. So in the video it says: Let's say I have a container. And in that container, I have gas particles and they're bouncing around like gas particles tend to do, creating some pressure on the container of a certain volume. And let's say I have n particles. Now, each of these particles could be in x different states. Now, if each of them can be in x different states, how many total...
View full post »
Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Let's say we have a cylinder of volume V1 with a frictionless movable piston and some gas trapped inside with pressure P1 and temperature T1. On top of the piston lay some small pebbles that add weight and essentially create the pressure P1. Also the system is inside a reservoir of water that keeps its temperature constant at T1. The system is in equilibrium at V1, P1, T1. Now let's say i put another very small pebble on top of the piston (0,00001kg) and after some seconds the system...
View full post »

Similar threads

I Heat pumps: Questions about compressor pump refrigerant gas and evaporator
Replies
30
Views
3K
B Gas cylinder at constant pressure being exposed to atmosphere, how?
Replies
8
Views
2K
I Questions about my Understanding of Thermodynamics and Statistical Mechanics
Replies
2
Views
3K
Can gas kinetic theory explain heat transfer from gas to a container?
Replies
6
Views
2K
I Yet again about (real) gas compression
Replies
20
Views
3K
Thermodynamics and ideal gas law concepts
Replies
14
Views
2K
I Irreversible adiabatic processes & entropy change (clarification needed)
Replies
22
Views
5K
I Calculating Cooling Effect in Gas Cylinder Expansion
Replies
3
Views
4K
Relation between pressure and volume when heating a gas
Replies
4
Views
1K
I Cannot understand formula for molar heat capacities of an ideal gas
Replies
22
Views
3K

Hot Threads

Recent Insights

Back
Top