AAMC 5 chem

[chiddler]

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How is this set up?

It really really looks like n[Acid]=[CP]

 

[EnginrTheFuture]

How is this set up?

It really really looks like n[Acid]=[CP]

It looks like for every CP_n molecule (which is one molecule with n subunits making a polymer) you have n acid molecules. This means that the concentration of polymer molecule(s) is proportional to (1/n) x (# acid molecules) 😀

This was quite the tricky question though, I have to admit that.

 

[chiddler]

It looks like for every CP_n molecule (which is one molecule with n subunits making a polymer) you have n acid molecules. This means that the concentration of polymer molecule(s) is proportional to (1/n) x (# acid molecules) 😀

This was quite the tricky question though, I have to admit that.

can you please explain

in equation form 😀

from what you've written:

"for every CP molecule"

CP

"you have n acid molecules"

CP = n*acid

which is exactly what i wrote D:

 

[MrNeuro]

can you please explain

in equation form 😀

from what you've written:

"for every CP molecule"

CP

"you have n acid molecules"

CP = n*acid

which is exactly what i wrote D:

this question had me for a while i tried for hours to setup a formula it just didn't work

i thought of it like this

1 Cp x = x HPO4

so if x is 10

1 Cp 10 = 10 HPO4

so what variable times 10 HPO4 = 1 mol of cp 10

1/10 [HPO4] = 1 Cp 10

replace 10 w/ n

1/n [HPO4] = Cp n

 

[EnginrTheFuture]

can you please explain

in equation form 😀

from what you've written:

"for every CP molecule"

CP

"you have n acid molecules"

CP = n*acid

which is exactly what i wrote D:

Sure... I think doing this out more storyline will be more effective. Just so you know A LOT of people made this exact same mistake. It seems to be a popular mathematical optical illusion that tricks people. I blame the use of n.

I have 10 reactants (CDP). So my n is 10 to start. I react all 10 of those to make:

A) 1, yes 1, CP_n <----- The n here in the formula is the number of subunits long the one molecule is.

B) 10 Acid molecules.

So these are both floating around happily in the same solution.... same VOLUME of solution, because it is the same liquid.

Thus:

[acid] = 10 molecules/ random volume
[CP_n] = 1 molecule/ random volume.... this is the same as 1/n times ^ that


If I said we had a radioactive decay...

A ----> 1B+ 2C

Would you say that at the end of that reaction B or C had the higher concentration? C right? Don't let the n's confuse you. Throw a random ass number in there and laugh in AAMCs face because it's totally legal to do so.

nA ------> xB + nC

the n does not relate B to C.... it relates A to C. The relation of B to C is x:n

the concentration of B is (xB's/nC's) x [C] or 1/n [acid] in this case.

 

[chiddler]

Ok! Then the important mistake that I made with my equation is

CP = n[Acid]

CP should not be there like that because this suggests it is increasing along with [Acid].

So a more appropriate formula is the one mrneuro wrote.

thanks you guys really helped me visualize this well.