"1.00 mol of methane is combusted irreversibly at constant room temp. Calculate the work associated with this process."
Why is the change in moles -2.00? Why don't we use 1.00 mol for n?
Search found 19 matches
- Mon Mar 07, 2016 12:25 pm
- Forum: Calculating Work of Expansion
- Topic: 2011 Midterm Q1B
- Replies: 2
- Views: 382
- Sun Mar 06, 2016 5:33 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Cycloalkanes and there conformations
- Replies: 2
- Views: 408
Re: Cycloalkanes and there conformations
Cycloalkanes with more than three carbons are nonplanar to relieve torsional and bond angle strain.
- Sun Mar 06, 2016 3:53 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Staggered and eclipsed succulents
- Replies: 1
- Views: 312
Staggered and eclipsed succulents
My succulents reminded me of staggered and eclipsed conformations. Enjoy!
- Tue Mar 01, 2016 3:30 pm
- Forum: *Electrophilic Addition
- Topic: Butene + Br2 Reaction (p. 85)
- Replies: 2
- Views: 747
Re: Butene + Br2 Reaction (p. 85)
Wouldn't the final product be C2H4Br2?
- Tue Mar 01, 2016 2:03 pm
- Forum: *Electrophilic Addition
- Topic: Butene + Br2 Reaction (p. 85)
- Replies: 2
- Views: 747
Butene + Br2 Reaction (p. 85)
Please refer to pg. 85 of the course reader. Is the reaction of butene with Br2 considered an electrophilic addition reaction, since the Br2 is polarized and one Br (partial positive) acts as an electrophile? Secondly, in the reaction of butene with Br2, the product we discussed in class is CH2BrC(+...
- Mon Feb 29, 2016 10:05 pm
- Forum: *Alkanes
- Topic: Neo, Iso, Tert, Sec
- Replies: 2
- Views: 293
Re: Neo, Iso, Tert, Sec
Edit: I'd say tert means the substituent is composed of a tertiary carbon, and sec means that the sub is composed of a secondary carbon.
- Mon Feb 29, 2016 9:50 pm
- Forum: *Alkanes
- Topic: Neo, Iso, Tert, Sec
- Replies: 2
- Views: 293
Re: Neo, Iso, Tert, Sec
I believe that's correct. Iso means that there are 2 methyls attached to CH, Neo means that there are 3 methyls attached to a C, Sec means that the substituent is bonded to a secondary carbon (a carbon that is bonded to 2 other carbons), and tert means that the substituent is bonded to a tertiary ca...
- Mon Feb 29, 2016 8:52 pm
- Forum: *Alkanes
- Topic: Quiz 3 Preparation
- Replies: 34
- Views: 11206
Re: Quiz 3 Preparation
Is number 2's (on the first quiz prep) IUPAC name 3-ethyl-2,2,4-trimethyl pentane and its common name 3-ethyl-2-methylneoheptane?
- Mon Feb 29, 2016 4:12 pm
- Forum: *Alkanes
- Topic: Common Name vs. IUPAC name
- Replies: 1
- Views: 339
Common Name vs. IUPAC name
If the question doesn't specifically ask for the IUPAC name or the common name, would either name given be correct then?
- Mon Feb 22, 2016 9:42 am
- Forum: *Electrophiles
- Topic: Memory Tips
- Replies: 8
- Views: 998
Re: Memory Tips
The way I think about it is Electrons are like the attractive mates everyone wants, but not everyone can have. "electro" = electrons and "-phile" means "loving." electrophiles love electrons, but unfortunately electrons don't love them back, so they are electron deficie...
- Thu Feb 11, 2016 9:37 pm
- Forum: General Science Questions
- Topic: The start of organic chemistry
- Replies: 1
- Views: 311
The start of organic chemistry
What material from Chem 14A would be most useful to review in preparation for organic chemistry?
- Sat Feb 06, 2016 4:13 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Some clarification on the "mole" unit
- Replies: 1
- Views: 318
Some clarification on the "mole" unit
Usually we use "n" to mean the number of moles. Some equations that use this are delta G = -nFE. How do we know when to include the "mol" unit and when not to? For example, in Ch. 14.9, delta G is in J/mol (from 2 * (C/mol) * (J/C), while in question 7B in the Winter 2011 midterm...
- Sat Feb 06, 2016 3:55 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Winter 2011 Midterm Question 7&8 C
- Replies: 1
- Views: 275
Winter 2011 Midterm Question 7&8 C
The question asks what is K_eq and delta G. I first found delta G by using the eqn delta G = -n*F*E. To find K_eq, I used the equation delta G = -RT*lnK. I know R, T, and now delta G (from above), and I solved for K. First I got that lnK = 6.4x10^3 J / (8.314J/kmol * 298.15K)=2.5689, then K = e^2.56...
- Tue Feb 02, 2016 2:14 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Course Reader pg. 41
- Replies: 1
- Views: 210
Course Reader pg. 41
The example asks at what temp is Br2(l) ---> Br2(g) spontaneous at 1 atm. To clarify, the question is not asking for the temp at the boiling point, right? We are solving for the temp greater than the boiling point temp, since the rxn must be spontaneous? I am confused because I have in my notes from...
- Sun Jan 24, 2016 5:36 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Drawing Heating Curves
- Replies: 2
- Views: 389
Drawing Heating Curves
When drawing heating curves, the enthalpies of vaporization and fusion guide how long to make the phase change line with slope = 0 relative to the x axis and the heat capacities of solid, liquid, and gas tell you how to sketch the slope. However, how would we know how long to sketch the line corresp...
- Mon Jan 18, 2016 11:27 am
- Forum: Phase Changes & Related Calculations
- Topic: 8.31 and 8.39
- Replies: 1
- Views: 293
8.31 and 8.39
8.31a is asking to calculate the q_p. I used the equation q_p = delta H = n * C_p,m * deltaT. We know that C_p,m = (5/2)R for Kr. So my calculation looks like: 5.025g Kr * 1mol / 83.80g Kr * (5/2) * 8.314 J/kmol * ((25.0 - 97.6 celsius) + 273). In the solutions manual, I do not understand why they d...
- Mon Jan 11, 2016 3:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7860
- Views: 1099512
Chemistry Jokes
I told a chemistry joke...
There was no reaction!
There was no reaction!
- Fri Jan 08, 2016 11:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 5th edition of textbook
- Replies: 2
- Views: 568
Re: 5th edition of textbook
So are the homework problems different? Do you recommend I purchase the sixth edition?
- Fri Jan 08, 2016 6:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 5th edition of textbook
- Replies: 2
- Views: 568
5th edition of textbook
I have the fifth edition of the textbook instead of the sixth edition. Is there a big difference, as far as the text and homework problems go? I know that the order of chapters are different. (I.e. Thermodynamics is covered in Ch. 7 of the 5th edition.)