When you decrease the temperature for a fixed mass of gas what happens to the pressure and volume?

Question

Also what happens if you keep the temp, pressure and volume the same but change the mass of the gas? Please help- physics module soon...

Answer 1

assuming ideal gas....


pv = nrt

n = moles = mass/ molecular weight
r is a constant

question (1)

if n = constant, then if T increases, PxV must also increase

question (2)

if p v and T are constant during a change in mass, then either the mw of the gas must change so that n must remain contant, or, more likely, the gas deviates from ideality.

Answer 2

Use the equation PV = nRT, the ideal gas law.
When you decrease temperature, either the volume or pressure (or both) has to decrease.

If you keep the temperature, pressure and volume the same you CANNOT change the mass of the gas. How would you do this? Remove molecules? if you do this, then "n" above changes, and one of the other parameters would have to as well.

Here is a good web site:
http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/idegas.html

Answer 3

The regulation of the conservation of mass says mass in no way transformations no count number what. count number can neither be created nor destroyed it would want to really replace form. For the volume stress questions, you should use Boyle's regulation. P1V1 = P2V2 you'll discover that stress transformations circuitously with quantity. for this reason, even as one will improve, the different decreases. even as stress decreases, quantity will improve. even as stress will improve, quantity decreases.