Question

A gas has a volume of 590 mL at a temperature of –55.0°C. What volume will the gas occupy at 30.0°C? Show your work.

Answer 1

use boyle's law, be sure to convert the temperatures into kelvin first

Answer 2

Actually, you are suppose to use Charles's Law. Which states that the volume of a gas is directly proportional to its temperature in kelvins. The first step to solving this problem is to convert any of the temperatures which are in Celsius to Kelvins, in your case what would need to be converted is -55C and 30C. The way you do that is by using this formula:. Once you have successfully converted from Celsius to Kelvin's, you must then use the formula:

V= Volume
T= Temperature

V1 and T1 stand for the initial volume and temperature.
V2 and T2 stand for the final volume and temperature.

V1= 590mL
T1= -55C converted to Kelvins

V2= ? (You need to solve to find the final volume)
T2= 30C converted to Kelvins

You can solve algebraically to find your answer. Don't forget to label V2 as mL.
It's very easy, and you can do it. Don't try to cheat your way through it. It doesn't do you any good. Like my mother says, "Without education, there will be elimination." If you need further assistance, just reply back. Have a great day.

Answer 3

Wow thank you very much. That was the most helpful response i have ever gotten.
Can you help me with this one?

What is the percentage of water in the hydrate CoCl2 • 6H2O?

Ok Im not good at science but im decent at math so im thinking that it could be easier than it looks? So what Im thinking is that there is 6 water molecules and two other elements so it could be 6/8 maybe? and the percentage is 75%? Am I right?

Answer 4

you can't use number of atoms when it comes to percent water, or mass percent. You have to use the masses of the pieces. Each unit of CoCl2 will be surrounded by 6 molecules of water, adding to the whole mass. The percent water in the hydrate will be the total mass of 6 waters over the total mass of the hydrate, both salt and water

Answer 5

So by mass you mean the number at the bottom of the name on the periodic table right?
So like this:

Co-58
Cl-35
H-1
O-15
CoCl2 • 6H2O
58+70+12+90= 230
then you just divide and find the percent?
12/230= about 5%

Can you give me feedback if i did this right or not??

Answer 6

I am so happy I was able to help you out, you have no idea how happy I am. I hope I made sense. :P

As for the question that you are asking right now, the formula for this would be



If you flip open your Prentice Hall Chemistry book to page 456, you'll see that they have a sample problem. Follow along with that. If you're still struggling with it, watch this video: http://www.youtube.com/watch?v=qzUMKWhWKm8 .
I haven't watched it all the way, but I'm sure it will help.

Answer 7

Woah I see where i messed up I did mass of hydrogen up top instead of water.
instead of 12/230 it would be 102/230?
so
percent of H2O= 102/230 = 44%
Does this look right to you Heather??

Answer 8

A gas has a volume of 590 mL at a temperature of –55.0°C. What volume will the gas occupy at 30.0°C? Show your work. (590mL)(-55C) divided by (30C) = 1081.67mL