BF2S Forums Chemistry question

I'd cheat off the Asian kid.

Ugh, this wasn't the purpose. I know how to do it.

What unit would you answer in, considering the question carefully? Note the bold words in opening post.


Edit: India is in Asia, so it would still technically be the Asian kid.

Last edited by nukchebi0 (2008-04-21 18:07:43)

cablecopulate wrote:

There are no bold words in the original post.

There should be now.

Last edited by nukchebi0 (2008-04-21 18:08:24)

steelie34 wrote:

grams?

That is what I'd think. Almost all the questions regarding percentage yield or "how much from x g of y substance" usually make you find the grams from what I've seen.

cablecopulate wrote:

I'd cheat off the Asian kid.

Charlie Goldberg?

Answer should be in grams, I suppose you could put in in liters assuming STP, but I wouldn't.

edit:

to the above, the question is in grams, answer in grams. Don't be lazy.

nukchebi0 wrote:

I was thinking "how much" implied an amount, which would be measured in moles.

an amount can be measured in grams too...

was it given to you in grams?

grams, final answer. i'm doing the same thing in chem right now.

It made sense to me as moles, and I got it wrong for that reason.

Ender2309 wrote:

nukchebi0 wrote:

It made sense to me as moles, and I got it wrong for that reason.

use the units that are given and stop trying to over analyze everything. and don't come here to complain about getting a wrong answer, because there's a lot of jackasses on this website. learn from it and move on.

I was going to bring it up with the teacher further, but the responses have convinced me to not continue it.

do you have to answer in moles, gramms or cubic meters?
If it has to be in volume then you would need the temperature too.
If it has to be in moles or gramms, then it is simple. You  calculate the carbon's mass amount into moles: (the mole mass of the carbon is roughly 12gramms/mole), and the methane will be half the amount of moles as the carbon you just calculated, and you can enumerate it to gramms if you have to (M(CH4)=16gramms/mole).
If you have a 95% percentage yield, it means that you converted 95% of the mass of the carbon into methane than the maximum.
So with a 100% yield you would have 0,23 moles (2,75/12) of carbon transform into 0,115 moles of methane, which is 1,84gramms.
Let's say that W(t) stands for the percentage yield, m(k) for the mass of methane you actually got, and m(e) for the maximum mass of metahne you could get from the amount of carbon. In this case W(t)=m(k)/m(e)*100%
So your W(t)=95% in this case, and your m(e)=1,84. From the equation you can calculate that the amount of methane you got is m(k)=1,748gramms. Almost the same as DrunkFace's result, so that will be a good answer imo.
Sorry for the long post but i felt like explain it, rather than just write in a number.