Resonance Structures

Do possible resonance structures of molecules have to follow the octet rule?

Take Home Test-- Various Questions

Mr. Holden,

Few questions here about the test....

1) On the first page that is devoted to stoich (for the most part), you say that there are 7.2L of CO2 at standard conditions. I use the standard conversion of 22.4 L/mol for standard conditions. Am i correct in assuming this?

2) When you are given a reaction with gases and you are given concentrations, can you just use the concentrations as if you were given a reaction with liquids and aqueous solutions in order to find the equilibrium constant?

thanks...

K equilibrium Lab

I do not understand the directions for the second post-lab calculation and analysis question. I graphed my data and it came to be linear. Then I drew a line of best fit. I do not understand how to determine the FeSCN2+ concentrations through the directions given in question 2.

I also think my numbers are messed up. For example, my results for data table 3 were 4.2x10^-4 M (FeSCN2+)eq, 5.8x10^-4 M (Fe3+)eq and .0016 M (SCN-)eq. When i solved for the K values in data table 3 with the equation K= Products/Reactants, my K value came around to 452. That seems a little off.....

Anyone have any suggestions or examples of what they think the correct data is?

-Mike

Weather Conditions

As schools have been closed tomorrow, the test is now scheduled for Tuesday when we return. The lab will be performed on Friday. Monday we'll be learning new material. I'll pass out the take home test on Friday, and I'll email it to anyone who needs it. Please email me so I can respond with the test.

Mr. Holden

Test 2/11

Mr Holden,

I wont be in school on friday, and there is a 2 hr delay so what is the test situation tomorrow?

thanks

Take Home Test

Mr. Holden, would it be possible for you to send me a copy of the take home test. I most likely will not be in school tomorrow or friday. Thanks

-Mike Drechsler

MichaelDrSmithtown@gmail.com

Equilibrium HW Questions 6 and 11

I cant get questions 6 and 11...

006 10.0 points

Given the following equilibrium data at 973 K

MgCl2(s) +12O2(g) ⇀↽MgO(s) + Cl2(g) Kp = 2.95 atm

MgCl2(s) + H2O(g) ⇀↽MgO(s) + 2HCl(g) Kp = 8.40 atm

Calculate the equilibrium constant Kp at 973 K for 2Cl2(g) + 2H2O(g) ⇀↽O2(g) + 4HCl(g) .

1. 24.8

2. 8.11

3. 5.50

4. 11.4

5. 2.85

-->Id guess that you would to a hess law kind of thing to the Kp's, but i really dont understand it.

Consider the following decomposition reaction at 700 K.

2CaSO4(s) --> 2CaO(s) + 2 SO2(g) + O2(g)

If Kp = 0.032 at this temperature, what

will be the equilibrium overall pressure starting

from pure CaSO4(s)?

1. 0.20 bar

2. 0.011 bar

3. 0.60 bar

4. 0.40 bar

5. 0.22 bar

-->I dont understand how theres a starting pressure from a solid. How do you relate Kp to pressure without any starting pressures?