can you help me??

Question

ok, so i need help with this chemistry problem(s)|||||

A gas sample at 83 degrees C occupies a volume of 1400 m3. At what temp. will it occupy 1200 m3?
> I got 4719 Kelvin|||||

A tank of compressed CO2 has a temp. of 23.6 C and a vol. of 31.4 L. The CO2 is completely transferred into a smaller tank that has a volume of 25.0 L. Assuming none of the CO2 escapes during the transfer, what is the temp. of the CO2 in the smaller tank if the temp. is lowered to achieve the same pressure as in the larger tank?
>>> I got 2.6 Kelvin||||||

Last problem,
A gas occupies .105 dm3 at 100 K. At what Celcius temp. will its vol. be at .140 dm3? assume the pressure remains constant.
>> With this question i guarantee that i got it wrong, my answer is -8.50 x 10 -5 K.||||||||||||||||||||||||


please and thank you ^_^

Answer 1

ok first we need that temp in kelvins so just add 273 to it and we get 356. Now the formula is v1/t1=v2/t2 lets plug in numbers

1400/356=1200/x and I like to use cross multiplication for these proportions so 1400x=1200*356

and I'm getting about x=305.1 K





now formula for this is the same obviously so lets get those temps in kelvins again. t1=296.6 so lets plug in

31.4/296.6=25/x

again cross multiply

x=25*296.6/31.4

x= about 236.1K

last one 105/100=140/x and again cross multiply

14000=105x
x=about 133.333K, and in C, that's -139.666

Answer 2

noooooooooooooooo way i can't help u i'm so sorry for that