Maybe someone can explain the logic

[shaq786]

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Three balloons are filled with 3 different gases so that they are equal in volume at 80 degrees C. The temperature is then decreased to 0 degrees C, and the volume and mass of the contents of each balloon are recorded. Which of the following statements is correct??

A. The contents will differ in mass but will be equal in volume
B. The contents will differ in both mass and volume.

Can someone please explain why?

 

[Code Brown]

Three balloons are filled with 3 different gases so that they are equal in volume at 80 degrees C. The temperature is then decreased to 0 degrees C, and the volume and mass of the contents of each balloon are recorded. Which of the following statements is correct??

A. The contents will differ in mass but will be equal in volume
B. The contents will differ in both mass and volume.

Can someone please explain why?

Someone correct me if I'm wrong here, but A is the right answer. Since you are dealing with ideal gases, the volumes, which are based on moles, will stay the same. PV = nRT. Since 1 mole of hydrogen weighs less than 1 mole of oxygen, the mass will be different.

 

[fonzy]

Three balloons are filled with 3 different gases so that they are equal in volume at 80 degrees C. The temperature is then decreased to 0 degrees C, and the volume and mass of the contents of each balloon are recorded. Which of the following statements is correct??

A. The contents will differ in mass but will be equal in volume
B. The contents will differ in both mass and volume.

Can someone please explain why?

Is it possible for any of the gases to change its form [gas to liquid]?

 

[shaq786]

Code brown...the answer is A. But my question is...what made you assume you were working with ideal gases? The question never states that we are working with ideal gases and yet the answer is A. But it could have been B if we werent working with ideal gases.

So on the mcat, are we supposed to assume that were always working with ideal gases unless otherwise stated??????

 

[Code Brown]

Code brown...the answer is A. But my question is...what made you assume you were working with ideal gases? The question never states that we are working with ideal gases and yet the answer is A. But it could have been B if we werent working with ideal gases.

So on the mcat, are we supposed to assume that were always working with ideal gases unless otherwise stated??????

From my understanding of the make up of the MCAT, always assume that gases behave as ideal gases. They will tell you otherwise if it's not, but in all honesty, they won't go beyond the PV=nRT formula.