Comparing Two Identical Gas Vessels

[jagged06]

Homework Statement

Two identical vessels contain different ideal gases at the same pressure and temperature. Which of the following statements are true? (Select all that apply.)

[]The total mass of gas is the same in both vessels.
[]None of these statements are true.
[]The average speed of the gas molecules is the same in both vessels.
[]The number of gas molecules is the same in both vessels.

Homework Equations

[URL]http://upload.wikimedia.org/math/4/3/f/43fa535941b0be935b3b173e1ce20338.png[/URL]

The Attempt at a Solution

The answers that make the most sense to me would be The total masses are the same, and the average speeds are the same, but that isn't right. Am I missing something important?

The answer could be multiple boxes.

 

[jagged06]

anyone have any ideas?

 

[Redbelly98]

The ideal gas law would be helpful here.

 

[jagged06]

Added the ideal gas law and looked at the problem again, but I'm still not sure.

 

[bjd40@hotmail.com]

here p,v and t are same and that implies n is also same for both the gases. now think what is n? i think that will help u.

 

[jagged06]

here p,v and t are same and that implies n is also same for both the gases. now think what is n? i think that will help u.

If n is the same, then they would have the same number of moles. But does that mean that their masses are the same? as in:

[x]The total mass of gas is the same in both vessels.
[]None of these statements are true.
[]The average speed of the gas molecules is the same in both vessels.
[x]The number of gas molecules is the same in both vessels.

or is it just the number of gas molecules is the same?

[]The total mass of gas is the same in both vessels.
[]None of these statements are true.
[]The average speed of the gas molecules is the same in both vessels.
[x]The number of gas molecules is the same in both vessels.

I've only got one more shot at this question so I want to make sure I am right, but the second one makes the most sense to me. If mass is in grams, different gasses could have the same number of molecules but different masses. correct me if I'm wrong.

 

[sjb-2812]

Sounds good to me, regardless of what you measure mass in, grams, ounces, ton(ne)s, ...