- #1

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Can someone maybe give me an equation to determine the number of molecules per unit volume (N/V) when the pressure(P) and the temperature(T) is given. The pressure is in PA and the temperature is in Kelvin.

Thanx

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- Thread starter MetalCut
- Start date

- #1

- 21

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Can someone maybe give me an equation to determine the number of molecules per unit volume (N/V) when the pressure(P) and the temperature(T) is given. The pressure is in PA and the temperature is in Kelvin.

Thanx

- #2

dav2008

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- #3

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- #4

dav2008

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Can you solve the ideal gas law for N/V?

- #5

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On the sunlit surface of Venus, the atmospheric pressure is 9.0 x 10 6Pa, and the temperature is 740K. On the earth's surface the atmospheric pressure is 1.0 x 10 5Pa, while the surface temp can reach 320K. These data imply that Venus has a "thicker" atmosphere at its surface than does the earth, which means that the number of molecules per unit volume (N/V) is greater on the surface of Venus than on Earth. Find the ratio (N/V)venus / (N/V)earth.

Thanx

- #6

dav2008

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You are trying to solve for N/V. Solve for N/V in the ideal gas law and see what it is dependent on.

- #7

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Ok but isn't N the number of molecules?

- #8

Hootenanny

Staff Emeritus

Science Advisor

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MetalCut said:Ok but isn't N the number of molecules?

Yes, N is the number of molecules, so as dav2008 says, solve for N/V and you will have your answer.

-Hoot

- #9

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Ok Thanx man.

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