Now i think im rite in saying that you are chemist of some kind or have i been diluded all this time? any how any will do heres me problem:
Im doing my bio coursework and investigation into the water potential of potato and parsnip, now thats all fine there just one bit i need help on.
i need to convert some percentage concentrations into molar mass so heres the info i think you'll need:
Were using Sucrose solution which started at 20% conc
From that we made up : 0.5%, 1%, 10%, and used 20% but how do i get this inot molar?????
ANy help is appriciated any mor einfo needed just ask:)
GRIM AKA a struggling Paul
You are right on track. I got a M.Sc. in chemical engineering and right now I have 10 months left to my PhD in inorganic chemistry (materials chemistry and nanotechnology).
Sucrose is glucose+fructose i.e. (C6H11O5)O(C6H11O5)
M = Molar mass (sucrose) = 12 x 12.011 + 22 x 1.0079 + 11 x 15.9994 g/mole = 342.2992 g/mole
20% sucrose concentration means 20 weight percent. If you have 1 litre of water it weighs 1000g (if we presume that the density is 1 g/cm3). This would mean that we have 200 g sucrose solved in the water if we have a 20% solution. We can now calculate how many moles of sucrose we have.
n (Sucrose) = m (sucrose) / M (sucrose) = 200 g / 342.2992 g/mole = 0.5842 mole
Then we immmediatly get that the concentration is 0.5842 mole/litre in the 20% solution.
I think you will manage to solve (no pun intended) the other percentages yourself.
This lecture will be repeated on BBC2 at 7.00pm for those who missed the early morning broadcast :lol:
w2g Sadako, I couldn't have put it better myself. No, really, I *couldn't*.
TL.
Nope, I couldn't have put that any better either :D
However, my degree is in Astrophysics and I do know that if you run at 0.866 the speed of light you can (momentarily) fit a 20 foot pole into a 10 foot garage due to Lorentz Contraction.
This exercise will be closely followed by a huge explosion as all the stored energy is released at once :devil:
Hope this helps :D
QuoteOriginally posted by Sadako@Mar 17 2004, 08:11 AM
You are right on track. I got a M.Sc. in chemical engineering and right now I have 10 months left to my PhD in inorganic chemistry (materials chemistry and nanotechnology).
Sucrose is glucose+fructose i.e. (C6H11O5)O(C6H11O5)
M = Molar mass (sucrose) = 12 x 12.011 + 22 x 1.0079 + 11 x 15.9994 g/mole = 342.2992 g/mole
20% sucrose concentration means 20 weight percent. If you have 1 litre of water it weighs 1000g (if we presume that the density is 1 g/cm3). This would mean that we have 200 g sucrose solved in the water if we have a 20% solution. We can now calculate how many moles of sucrose we have.
n (Sucrose) = m (sucrose) / M (sucrose) = 200 g / 342.2992 g/mole = 0.5842 mole
Then we immmediatly get that the concentration is 0.5842 mole/litre in the 20% solution.
I think you will manage to solve (no pun intended) the other percentages yourself.
:rolleyes: I was gonna say that.
Stop following me round the forums Ron I'm getting a complex :narnar:
QuoteOriginally posted by BlueBall@Mar 17 2004, 10:00 AM
Nope, I couldn't have put that any better either :D
However, my degree is in Astrophysics and I do know that if you run at 0.866 the speed of light you can (momentarily) fit a 20 foot pole into a 10 foot garage due to Lorentz Contraction.
This exercise will be closely followed by a huge explosion as all the stored energy is released at once :devil:
Hope this helps :D
And for those of you who don't know about the special theory of relativity:
http://www.fourmilab.ch/cship/lorentz.html (http://www.fourmilab.ch/cship/lorentz.html)
Nice site Sadako. I've bookmarked it for future reference (homework etc)
QuoteOriginally posted by BlueBall@Mar 17 2004, 09:04 AM
Stop following me round the forums Ron I'm getting a complex :narnar:
Getting?
wow thanks alot sadako :):):):) im off to finnish me write up now
QuoteOriginally posted by GRIM_REAPER@Mar 17 2004, 10:42 AM
wow thanks alot sadako :):):):) im off to finnish me write up now
I think you'll find he's Swedish
Oh ffs Zok that was truly bad.
Well done m8 :D
:learn: Hey Mats, you know how to calculate buildingconstructions aswell? You can make a test for me then. ;) BTW, I almost had the same answer.
QuoteOriginally posted by DuVeL@Mar 17 2004, 12:11 PM
:learn: Hey Mats, you know how to calculate buildingconstructions aswell? You can make a test for me then. ;) BTW, I almost had the same answer.
1 building construction + 1 building construction = 2 building constructions :D
Easy peasey :)
just to check im on the right track or am i compleatly wrong to get that mole's per litre into the 10% equivelent do i just need to half it or is it not that simple?
QuoteOriginally posted by GRIM_REAPER@Mar 17 2004, 04:50 PM
just to check im on the right track or am i compleatly wrong to get that mole's per litre into the 10% equivelent do i just need to half it or is it not that simple?
Indeed.
Or just enter 100 g in the given expression.
ok thanks alot for your help ill inform you of my grade in due course :)
Don't you mean you'll inform him of the grade he got :D :narnar:
well see ing as those numbers are about a 100th of what ive dpne so far minus conclusion and eval i tnk ill have earnt it :)
Will you be taking English language next?
I thought it was sheepy posting for grim myself
who needs english wenh iev gto a prefectyl gdoo seplingl chqua !!!
oh and would i be right in saying that glucose and fructose are isomers ? the more science type words i can use all the better im pretty sure they are isomers but just to check ;)
QuoteOriginally posted by GRIM_REAPER@Mar 17 2004, 06:20 PM
fructose
A Chinese fella falls works in a sweet factory, one day walking past the sugar mixer his foot sticks in some fructose and he over balances and falls in. Unfortunately he loses all of his toes on the blades and his little finger.
When he is rescued and the man sees the state he's in, he says
"What the hell happened, you've lost your toes, how did you slip?"
And our Oriental hero replies "Fructose, it's my rittle finger I'm worried about, I'll never play guitar again"
It's all in the game, because the game is where I'm in and I'll see you in the game.
had to read that a couple of times to get it but very good Benny.
:lmfao:
argh benny did you make that up all on your own who's a clever boy then?, yes you are, yes you are :):):):) go have a doggy treat ;)
Duuuuuude
Sweeeeeet