Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
$H00t!N& $t@r:
--- Quote from: Ari Ben Canaan on May 30, 2011, 03:28:19 pm ---The question says 1cm3 of ice is heated.
Using the formula density = mass/volume you should be able to determine the mass of ice heated.
Next, you must realise that ice is basically water... Can you calculate the no. of moles of water in 1 gram of ice ? Should be easy.
Now, use the formula PV=nRT.
Rearrange for Volume. Remember the volume you calculate will be in m3 NOT dm3.
--- End quote ---
For this one, I got 2.72 instead of 2.67 :-[
$H00t!N& $t@r:
--- Quote from: Ari Ben Canaan on May 30, 2011, 03:33:37 pm ---You should be able to eliminate two of the options straight away.
In this scenario, look for the carboxylic acid group.... COOH. Also, look for carbons with four different structures attached to them.
--- End quote ---
I understand it now. :)
elemis:
--- Quote from: $H00t!N& $t@r on May 30, 2011, 04:24:21 pm ---For this one, I got 2.72 instead of 2.67 :-[
--- End quote ---
Yes, that's what I got too. The reason they put 2.67 is to probably test your confidence.
$H00t!N& $t@r:
--- Quote from: Ari Ben Canaan on May 30, 2011, 04:34:00 pm ---Yes, that's what I got too. The reason they put 2.67 is to probably test your confidence.
--- End quote ---
ah i see.. :D
SkyPilotage:
--- Quote from: Ari Ben Canaan on May 30, 2011, 04:34:00 pm ---Yes, that's what I got too. The reason they put 2.67 is to probably test your confidence.
--- End quote ---
Hmm...Well There is another way to solve it...
-Its given that there are 24 dm3 in 298K
So whats the volume in 596K? Cross multiply to get 48 dm3...
-1 mole-------------->48 dm3 ( at 596K)
-X mole-------------->Y dm3 (at 596K)
To find out the number of moles of ice..We have the mass as 1g and molar mass as 18g..So cross-multiply to get 2.666666666666 dm3.....
I think using the PV=NRT doesnt give the exact answer since steam is NOT an ideal gas. :)
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