alot of the people here are older than me so this question should be easy, and since there is no board for this, i will ask here. this is science and it involves boyle's law.i already know how to set up the formula witch in my question would be "P2=(22.5 kPa)(155 cm cubed)divided by 90 cm cubed" and P stands for pressure. it wants me to solve for P2. ??? ???
What the hell is that?
it a stupid science question, i hate formulas. :(
Eh...too bad I got a C+ in Chemistry. >_>
here is a better layout
(22.5 kPa)(155 cm cubed)
P2=-----------------------------------
90 cm cubed
Ummm... I have no clue... ???
The anwer is p=42 your done
Quote from: phatyo on September 29, 2007, 01:08:40 PM
The anwer is p=42 your done
Did you ACTUALLY do that!?
how the heck did you do that? ???
i need more help with HOW to do it, because i have more questions like it.
Quote from: SBSTN1 on September 29, 2007, 01:12:14 PM
i need more help with HOW to do it, because i have more questions like it.
On the old Nsider there was a home work help team :/ some one needs to come up with the same thing here!
actually that would have to be wrong. if volume 2 is less than volume 1, wouldn't pressure 2 be less than pressure 1?(pressure 1 is 22.5 kPa)
Don't you just have to multiply the top two numbers, and then divide by the bottom? >_>
Quote from: Silverhawk79 on September 29, 2007, 01:17:11 PM
Don't you just have to multiply the top two numbers, and then divide by the bottom? >_>
that is the first thing i though, but then i thought that would be multiplying the pressure into the volume, and it seems weird to do that.
Boyle's Law:
P1 * V1 = P2 * V2
P1 = 22.5kPa
V1 = 155 cm^3
P2 = ?
V2 = 90cm^3
So.....we plug in the values:
22.5 * 155 = P * 90
=
3,487.5 = P * 90
Solve for P by dividing 3,487.5 by 90, and: 38.75kPa.
Gas laws are actually very simple. Just plug in the values you have, and then just do the basic algebra to finish it off. I never got it at first either, but trust me, once you do get it, you will feel really dumb for not getting it sooner. I sure as heck did.
thank you very much, i am in home school so i don't have very many options when i do get confused with a question.