solve this question!

[atlanta213]

Consider a vessel with argon gas. This vessel is now replaced with helium gas. If both vessels contain 10 moles of gas, which is true?

a- pressure changes
b- temperature changes
c- density changes
d- number of molecule changes

I believe temperature and density changes according to Mw=drt/p

But answer is c only!

Let me here your thought on this.

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[atlanta213]

no one?

 

[TeamGuo]

P and T stays the same because you didn't put any external heat or didn't take out any. Same as P, it stays same since you still have 10 moles of gas in there.

Density would change since the MW of the 2 gases are different.

Since MW = mass/Vol from the ideal gas law equation, your density would change.

 

[ongmeister]

P and T stays the same because you didn't put any external heat or didn't take out any. Same as P, it stays same since you still have 10 moles of gas in there.

Density would change since the MW of the 2 gases are different.

Since MW = mass/Vol from the ideal gas law equation, your density would change.

Yup, only the density will change, as the Temperature and Pressure. A good way to think of it is that they both have the same number of moles. From the PV=nRT eq.