Question

Hard chemistry study guide question i do not understand.. If you answer i will fan you :)

Answer 1

Given 2.91 moles of a gas in a 500 milliliter-container, if the temperature is found to be 31 degrees Celsius, what is the pressure of the gas? (The ideal gas constant is 0.0821 L · atm/mol · K.)

Answer 2

1.45 x 102 atm
1.48 x 101 atm
1.45 x 10-1 atm
1.45 x 101 atm

Answer 3

PV=nRT. Make sure all of your units match the gas constant's units.

Answer 4

what does p stand for?

Answer 5

Pressure. That is what you are solving for.

Answer 6

And n ? V stands for volume, R stands for rate and T stands for temperature?

Answer 7

n is number of moles and R is the ideal gas constant.

Answer 8

and yes, T is temp and V is volume

Answer 9

Soo..
(P)500ml = (2.91)(31) ?

Answer 10

P(500Ml) = (2.91)(0.0821 L · atm/mol · K)(31) *

Answer 11

Units need to match the gas constant, so V needs to be in L, not mL and T needs to be in K, not C.

Answer 12

Okay soo correct me if im wrong..
p(0.5L) = (2.91)(0.0821 L · atm/mol · K)(304.15)

Answer 13

You re not wrong. ;)

Answer 14

Yay!

Answer 15

Now i just have to calculate?

Answer 16

:) Yup.

Answer 17

Idk how to... lol xD

Answer 18

Solve for P by diving by .5 on both sides.

Answer 19

Well i mean i get the basics but all the atm/mol stuff confuses me

Answer 20

haha, ok. All of the units should cancel except atm.

Answer 21

which is a pressure unit.

Answer 22

so wait 2.91/.5 ?

Answer 23

Ugh now im confused ha

Answer 24

or 2.91 * .5

Answer 25

No, (2.91*.0821*304.15)/.5

Answer 26

Does that help?

Answer 27

I got 14.5

Answer 28

I got 145...

Answer 29

hmm wel how does either of ours fall into one of the answrs haha

Answer 30

Mine is 1.45 x 10^2 atm

Answer 31

Putting it into scientific notation.

Answer 32

Okay so that is the answer? And how do you do that ?

Answer 33

Yours is 1.45 x 10^1 atm

Answer 34

Okay.. hmm did i do it wrong?

Answer 35

That is what I get.

Answer 36

I did it on my phone calculator not my graphing one maybe i made a mistake

Answer 37

Maybe. It should work either way.

Answer 38

Yeah let me double check real quick

Answer 39

Yeah i got 145! i mustve put 5 in my calculator instead of .5 haha

Answer 40

Scientific notation makes big numbers easier to look at. this one is small enough that it is a little silly...but 1.45 x 10^2 is the same thing as 1.45 * 100, which is 145.

Answer 41

Yay!

Answer 42

Okay duh lol I always forget simple concepts. Okay Thanks you soooo much youre the best :D

Answer 43

No worries. Keep practicing and you'll get it. L:)

Answer 44

I will! Thanks again :)