Question

PLEASE HELP WILL AWARD MEDAL!
A pressure of 743 mm Hg is equal to how many atm?

Answer 1

\[1 atm = 760 mmHg\]

By using dimensional analysis you'll get


\[743 mmHg * \frac{ 1atm }{ 760mmHg } = 0.977 atm\]

Answer 2

THANK YOU SOOO MUCH @Technodynamic

Answer 3

I'd round it though to 0.978 atm for more accuracy

Answer 4

Yeh it asks for three sig figs @Technodynamic

Answer 5

You're welcome!
Correct answer based on accuracy: 0.978 atm

Answer 6

Do you know how to do Percentge Yield? @Technodynamic

Answer 7

Yes.
\[Percent Yield = \frac { actual }{ theoretical } * 100% =\]

Answer 8

I'm sorry if i'm being such a nuisance but i'm taking a quiz I missed from week, since I was absent to know the material could you help me out?

Answer 9

@Technodynamic

Answer 10

Its stuff like this-
A sample of gas at 47 ºC and 0.97 atm occupies a volume of 2.20 L. What volume would this gas occupy at 107 ºC and 0.789 atm?

Answer 11

But there is Temp. Do I avoid that?? @Technodynamic

Answer 12

Thats what Im confused on.
How do I solve it if they give me more than 3

Answer 13

Sorry, typo.

\[\frac{ P_1V_1 }{ T_1 }= \frac{ P_2V_2 }{ T_2 }\]

Answer 14

Plug the first numbers into the equation on the left. For the second sentence, plug those numbers on the right side. Then divide.

Answer 15

Don't worry, I'll walk you through the steps...

Answer 16

OK one moment

Answer 17

can you repost your question into a new question box? my tablet won't scroll any farther

Answer 18

Yeah sure

Answer 19

A sample of gas at 47 ºC and 0.97 atm occupies a volume of 2.20 L. What volume would this gas occupy at 107 ºC and 0.789 atm?

Answer 20

Ok so I have this-
T1= 320k
P1=.97
V1=2.20
T2=380
P2=.789

Answer 21

Yes that's correct

Answer 22

OK so am itrying to find V2?

Answer 23

Yep, you're doing this correctly

Answer 24

You just plug in the numbers, divide, and boom you're done!

Answer 25

Ok so (.97)(2.20)/320= .789/380
?

Answer 26

That looks about right

Answer 27

So did you get 1.9994?

Answer 28

If you typed it in the calculator

Answer 29

My calc is charging but let me get some paper...one sec

Answer 30

I justw ant to be sure before i submit my answer. Cause i Multiplied the top and divided by the two temps at the bottom

Answer 31

or do you cross multiply them.. or am i just confusing myself.

Answer 32

It's asking for the volume, so in this case you will be dividing

Answer 33

SO what did i do wrong.

Answer 34

I divided the temp into P and V

Answer 35

You arranged it correctly.
After you calculate the left side, and the right side.
You will make the left side your numerator and the right side denominator when dividing.
Did you do it that way?

Answer 36

OH no I didnt I juts took the two temps to make my denominator

Answer 37

Yes that part is right

Answer 38

Now im confused

Answer 39

(.97*2.20)/(320) =

(0.789)/380 =

Answer 40

OK

Answer 41

and so i divide them?

Answer 42

After you solve that. Divide both the answers

Answer 43

I got this .0066875/.0020763158=3.211818742

Answer 44

Excellent!

Answer 45

Thank you very much

Answer 46

Yw!

Answer 47

Can I ask you what Law I use for :
The pressure exerted on a 243 mL sample of hydrogen gas at constant temperature is increased from 0.428 atm to 0.724 atm. What will the final volume of the sample be?
@Technodynamic

Answer 48

I thought the Combined gas law but it doesnt give me temp. only pressure and volume

Answer 49

alright here's how you do it...

Answer 50

I dont understand why its so complicated, ive been at this for 3 hours..... sigh

Answer 51

i answered your initial post from your other post with the worked out answer. Hope that helps!

Answer 52

Go check it :)