Collisions of molecules: Calculating Collision Rates in a Gas Box

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Homework Help Overview

The problem involves calculating the rate of collisions of nitrogen molecules in a 10 cm3 box at 20 degrees Celsius. The context is rooted in kinetic theory and gas laws.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster expresses confusion about how to start the problem, particularly regarding the need for mass or the number of molecules. They question the relevance of Avogadro's number in this context. Another participant suggests using the ideal gas law to determine the number of moles based on the volume of the box and the conditions given.

Discussion Status

Participants are exploring different interpretations of the problem, with some guidance provided on how to relate the volume of the gas to the number of moles. There is no explicit consensus yet, as the original poster is still seeking clarity.

Contextual Notes

The original poster notes a lack of information regarding the mass of the gas and expresses confusion about the problem setup. The discussion includes references to ideal gas behavior and relevant constants.

fredrick08
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[SOLVED] collisions of molecules..

Homework Statement


a 10cm^3 box contains nitrogen at 20degreeC. What is the rate of collisions on one wal of he box.


Homework Equations


kb=1.38x10^-23
1u=1.661x10^-27
molecular mass of N2=28u
avagadros number=6.02x10^23mol^-1
vrms=sqrt((3kbT/m))
rate of collisions=(1/2)(N/V)Av

The Attempt at a Solution


omg i got no idea where even start with this one... I am pretty sure i could do it if they gave me the mass of the gas or the number of molecules... but I am just stuck... y do they give me avagdros number? I am srry I am just really confused bout this one... anyone please help??
 
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n=N/Na?? but i don't know n?
 
Remember, an ideal gas (such as N2) has a molar volume of 22,400 cubic centimeters per mole at STP (Avogadro's Law).

We know the volume of the box, so we know how many moles of ideal gas there are at 20°C, so we know how many molecules there are.
 
Last edited:
oh ok ty
 
You're very welcome.
Once you're satisfied with the problem, please change the title to "[SOLVED] Collisions of molecules".
Good luck!
 

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