Recent content by jippetto

Oh! Thank you, I hadn't considered that. So please let me know if this is wrong: to form the tropylium cation, the benzyl group is cleaved and it rearranges to incorporate the extra carbon into a 7-membered aromatic ring, which is the large signal at 91. Then the minor signal at 65 is due to the...

Thanks very much for the response, I am pretty confident with the conclusions I have come to already from the IR, NMR, and MS; what I cannot figure out and is being asked of me is to actually assign all peaks in the MS. That's essentially my problem: Once again, thanks for your insight; if...

I hope that the reason nobody hasn't posted anything on this yet isn't because of some mis-formatting on my part. Please let me know if I wasn't clear enough!

I think gabriel was implying that since sodium benzoate is a salt, it would dissolve in an aqueous solution. But I don't think that would happen in HCl. Maybe I'm misinterpreting something though.

Biodegradable polymers versus non-biodegradable polymers. Polymerization is pretty much in organic chemistry's domain.

The previous reply would be correct but HCl is a stronger acid than benzoic acid, so in HCl, sodium benzoate would react to form benzoic acid, which is insoluble in acidic aqueous solution. I'm pretty sure this is the right way to think about it, but not 100% sure.

Homework Statement I've been given the IR spectrum, 1H NMR, and Mass Spec data for an unknown and must identify it correctly and assign all significant spectroscopy/spectrometry signals to the molecule accordingly. I am probably 95% sure that my compound is ethyl phenylacetate, and I've...

no the limit has to exist because the only way it wouldn't was if a_k or k were 0, which would make the summations pretty stupid because adding up infinitely many terms of 0 obviously converges to 0, or the limit could equal infinity which does satisfy the test (L>0). I'm telling you man limit...

yeah bpw91284 has it right. drpizza, the pressure isn't staying the same so you have to solve for a different number of moles. so yeah it's like I said: P_1/n_1=P_2/n_2

it's been a while since thermo but can't you negate the temperature and volume of the container because they are fixed? then you are left with the knowns and unknowns you need to solve? then it's P_1/n_1=P_2/n_2 right? forgive me if I'm way off.

use the limit comparison test... if lim(n->infinity) of (a_k/k)/(a^2_k) = L > 0 (is greater than zero because a_k has all nonnegative terms) and sum of (a^2_k) converges (which it says it does), then sum of (a_k/k) must converge by the limit comparison test lim(n->infinity) of (a_k/k)/(a^2_k)=...

So i think I'm correct in assuming that the error function is the integral of the function e^(-x^2), but that it can only be expressed in terms of a Taylor series. is it really impossible to express it in terms of elementary functions? with this same function [e^(-x^2)], how would you...