gas law confusion?

[marmar]

---

Members do not see this ad.

ok so the Kaplan blue book says that in high pressures the gases deviate from the ideal gas law and the molecules are closer to each other so their volume becomes significant so the actual volume is higher than that predicted by the ideal gas law. now the kaplan test has a question that says the following statement is tru:

for real gases
A) at high pressure, a gas's volume is less than expected because of intermolecular attractions.

so these two contradict and I know both make sense to me separately, so what do you guys think is correct if we have both condition on the exam.

 

[PooyaH]

ok so the Kaplan blue book says that in high pressures the gases deviate from the ideal gas law and the molecules are closer to each other so their volume becomes significant so the actual volume is higher than that predicted by the ideal gas law. now the kaplan test has a question that says the following statement is tru:

for real gases
A) at high pressure, a gas's volume is less than expected because of intermolecular attractions.

so these two contradict and I know both make sense to me separately, so what do you guys think is correct if we have both condition on the exam.

Pressure and volume are inversely related. Volume increases when pressure decreases and volume decreases when pressure increases. Also, Volume is directly related to the number of moles of gas and temperature.

 

[ucla2134]

ok so the Kaplan blue book says that in high pressures the gases deviate from the ideal gas law and the molecules are closer to each other so their volume becomes significant so the actual volume is higher than that predicted by the ideal gas law. now the kaplan test has a question that says the following statement is tru:

for real gases
A) at high pressure, a gas's volume is less than expected because of intermolecular attractions.

so these two contradict and I know both make sense to me separately, so what do you guys think is correct if we have both condition on the exam.

I think you are confused between gas as a whole and individual gas volume molecules

 

[osimsDDS]

ok so the Kaplan blue book says that in high pressures the gases deviate from the ideal gas law and the molecules are closer to each other so their volume becomes significant so the actual volume is higher than that predicted by the ideal gas law. now the kaplan test has a question that says the following statement is tru:

for real gases
A) at high pressure, a gas's volume is less than expected because of intermolecular attractions.

so these two contradict and I know both make sense to me separately, so what do you guys think is correct if we have both condition on the exam.

No you are correct, but you have to realize that volume is higher than expected when you have EXTREMELY high pressures...with moderately high pressures the volume will be lower than expected because volume and pressure are inveresely related but when you have exteremely high pressures the volume of the individual atoms gets larger and therefore the volume gets larger...

I mean its not like the DAT would have you know exactly at what pressure that would happen so i wouldnt worry about it but i have read that volume does at some point correlate to high pressures but again only at exteremely high pressure...other then that they are inveresely related and that is probably the most important thing you should remember...