Tuesday
September 30, 2014

Posts by Brunette


Total # Posts: 25

Re: chemistry
The average pH of open ocean water is 8.1. What is the maximum value of [Fe3+] in pH 8.1 seawater if the Ksp of Fe(OH)3 is 1.1*10^-36? chemistry - DrBob222, Friday, December 7, 2012 at 10:14pm Fe(OH)3 ==> Fe^3+ + 3OH^- pH = 8.1 pH + pOH = pKw = 14 Therefore, pOH = 14-8.1...
December 8, 2012

chemistry
The average pH of open ocean water is 8.1. What is the maximum value of [Fe3+] in pH 8.1 seawater if the Ksp of Fe(OH)3 is 1.1*10^-36?
December 7, 2012

chemistry
How much NaOH (g) would you need to dissolve in water in order to prepare 2.75 L of a NaOH solution in which [OH-]= 0.50 M?
November 23, 2012

chemistry
Nevermind. I figured it out.
November 23, 2012

chemistry
Nevermind. I figured it out.
November 23, 2012

chemistry
The equilibrium constant Kc for the reaction C <--> D + E is 7.90 * 10^-5. The initial composition of the reaction mixture is [C]=[D]=[E]=1.10*10^-3. What is the equilibrium concentrations of C, D, and E? C=? D=? E=? chemistry - DrBob222, Monday, November 5, 2012 at 12:...
November 5, 2012

chemistry
The equilibrium constant Kc for the reaction C <--> D + E is 7.90 * 10^-5. The initial composition of the reaction mixture is [C]=[D]=[E]=1.10*10^-3. What is the equilibrium concentrations of C, D, and E? C=? D=? E=?
November 4, 2012

chemistry
Given the balanced equation for the decomposition of INO, and the rate of disappearance of INO, write the expressions for the rates of appearance of I2 and NO 2INO(g) ---> I2(g) + 2NO(g) Reactant: Product(I2): Product(NO): -∆[INO]/2∆t = ??/?? = ??/??
October 15, 2012

Chemistry
U(s) + 3F2(g) ---> UF6(g)
October 15, 2012

chemistry
I keep trying that and it is saying that I have the wrong answer. here is my work: slope: -1.19*10^4 y-intercept= 30.439 Ea: -(-1.19*10^4 K) *(8.314J/moK)= 9.89*10^4 J/mol A= e^30.439= 1.65*10^13 (1.65*10^13) e^-(9.89*10^4J/mol/8.314*300 K)= 9.98*10^-5 I keep getting different...
October 14, 2012

chemistry
Values of the rate constant for the decomposition of N2O5 at four different temperatures are as follows: T(K) k(s^-1) 658....2.14*10^5 673....3.23*10^5 688....4.81*10^5 703....7.03*10^5 The activation energy is 1.02*10^2 kJ/mol. Calculate the value of the rate constant at 300 K
October 14, 2012

chemistry
nevermind, I got it. I must have been putting the numbers in wrong or something. :)
October 14, 2012

chemistry
Cl2O2 (g)---> 2ClO (g) Time [Cl2O2] (M) 0....... 6.60*10^-8 172..... 5.68*10^-8 345..... 4.89*10^-8 517..... 4.21*10^-8 690..... 3.62*10^-8 862..... 3.12*10^-8 Determine the value of the first-order rate constant. For this question, you need to graph it on excel in order to...
October 14, 2012

chemistry
I found the answer for carbon tetrachloride. I just need to find it for n-butane (C4H10) and ethanol and the database is saying the answers are wrong. I dont understand why if the format is the same as the carbon tetrachloride
October 7, 2012

chemistry
Predict the boiling point of the following compound using Trouton's Rule: Heat of vaporization/Tb= 80 J/K Carbon tetrachloride (CCl4) = ?? degrees Celsius
October 7, 2012

chemistry
at high temperatures, ammonia decomposes to N2 and H2. 2 NH3(g)--> N2 (g) + 3H2(g) Delta H for the reaction is positive and delta S is positive. Estimate the temperature at which this reaction becomes spontaneous
October 5, 2012

chemistry
Thank you!
October 5, 2012

chemistry
I did this and the database said the answer was wrong: (213.8 + 70.0) - (186.2 + 2*205.0)= -312.4 j/K*mol. Am I missing something?
October 5, 2012

chemistry
The following reation has the following standard thermodynamic parameters: delta H= -33.6 kJ/mol delta S= -59.8 J/(mol*K). C(g) + D(g) --> E(g) Calculate the temperature at which the reaction becomes nonspontaneous.
October 5, 2012

chemistry
How much energy is required to vaporize 75.5 mL of ethanol (C2H5OH, d=0.789 g/cm^3) at its boiling point, if its heat of vaporization is 40.5 kJ/mol?
September 30, 2012

chemistry
The following is kinetic rate data taken as absorbance of reactant vs. time: A: ln(A): Time/min: 0.532 ?? 0.0 0.484 2.54 0.442 5.12 0.395 8.35 0.350 11.95 fill in the ln(A) column
September 24, 2012

chmistry
Compound: Concentration: Measured deltaT LiCl 6.00 g/kg 0.492 deg C HCl 4.00 g/kg 0.389 deg C NaCl 6.00 g/kg 0.356 deg C Determine the value of the vant hoff factor for each salt for the experimentally measured delta T value. (kf=1.86) I have tried to figure this out, but it ...
September 14, 2012

chemistry
Determine the melting point of an aqueous solution containing 115 mg of saccharin (C7H5O3NS)added to 1.00 mL of water (density of water=1.00 g/mL, Kt=1.86 C/m)
September 11, 2012

chemistry
thank you so much!
September 1, 2012

chemistry
20.0 mL of a 0.125 M solution of potassium iodide is added to 15.0 mL of a 0.235 M solution of lead (II) nitrate. A reaction occurs via the balanced equation below: 2KI(aq)+ Pb(NO3)2(aq) --> 2KNO3(aq) +PBI2(ppt) How much product can theoretically be produced in the reaction...
September 1, 2012

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