Recent content by NYK

In the second case the LR is the acid. When i do that calculation I find that the [H3O+] = .04875 mol/L the answer is 21 mmol/L and a pH = 12.3

Homework Statement Calculate the the molar concentration of H3O+ ions and the pH of the following solutions: a) 25.0 cm3 of 0.144 M HCl(aq) was added to 25.0 cm3 of 0.125 M NaOH(aq) b) 25.0 cm3 of 0.15 M HCl(aq) was added to 35.0 cm3 of 0.15 M KOH(aq) c) 21.2 cm3 of 0.22 M HNO3(aq) was added to...

S = 4πr2? then d(V(P1/RT))/dt = -S((DH/L)P1) dV/dt = -S(DH/L)RT dV = -(4πr2)(DH/L)RTdt

http://www.ece.gatech.edu/research/labs/vc/theory/oxide.html that is where i found C = HP But I did find the same eqn you are talking about where H = P/C in the textbook

Co = 10 mol/cm^3?

Hi Chet, I am in a class right now, but just to run a thought by you before I am able to continue working on this problem, the partial pressure outside of the balloon of the helium would be 0 atm, there isn't any boundary creating a pressure when the helium escapes through the rubber walls to...

Hi Chet thank you for the tips on getting started, I used the ideal gas law (since the problem states to assume a quasi steady state) and found the number of moles of helium in the balloon initially to be: n = PV/RT = (2 atm*33510.32cm^3)/(82.06(cm^3*atm/mol*K)*298.15K) = 2.739 mol He Using...

Homework Statement A (spherical) rubbery balloon of 20 cm in diameter is filed with helium. The rubber balloon wall has a thickness of 0.05 cm and diffusivity of 0.1x10-10 cm2 /s for helium. When the balloon is left in the air at 25°C, helium leaks into the air by diffusion through the rubbery...

The error code i get is that "Function definitions are not permitted in this context", but i really don't need a function file. I have begun writing it as a regular script file.

Thanks RUber, you are compltely correct, I read the problem statement a little more closely and releaized i wasnt do it correct. So I've tried working with this: clear;clc n =[2 5 50] do=linspace(-2*pi,2*pi,720); for i =1:720 for k=1:1:50 ns=2*k+1...

I am trying to write a script that will compute repeatedly, beginning with step size h=1 and then progressively divide the step size by a factor of 10 to demonstrate how round-off error becomes dominant as the step size is reduced. In using centered difference approximation of O(h2) to estimate...

I have been working on writing g a script file that will: Calculate f(x)=5sin(3x) using the Taylor series with the number of terms n=2, 5, 50, without using the built-in sum function.  Plot the three approximations along with the exact function for x=[-2π 2π].  Plot the relative true error...

when r = a, B = (μo/2πr)Io(1-((a-a)/(b-a)) B = (μo/2πr)Io(1 - 0) So B = (μo/2πr)Io as expected :) Thank you for all your help TSny!

I just looked at it and would it actually be: B = (μo/(2πr))Io(1-((r-a)/(b-a)) the 2π is canceled it in the Ienc so there is still the 2π left over in the B2πr = Iencμo equation i started with I was cancelling out the 2π because i hadn't made the substitution for Jo yet, which ends up having...

No problem, I just really appreciate all your help. So after making the corrctions to the B field in post 3 I come up with, for a < r < b; B = (μo/r)Io(1-((r-a)/(b-a))