Search found 5 matches

by Hogan Irwin 3A
Sun Feb 12, 2017 12:48 pm
Forum: Balancing Redox Reactions
Topic: Creating Cell Diagrams
Replies: 2
Views: 476

Creating Cell Diagrams

Question on Finalizing a Cell Diagram: After balancing the half reactions and forming the balanced equation for a skeletal equation do we carry over the coefficients from the balanced cell reaction into the final cell diagram? Or do we write the cell diagram with the moles of the original species in...
by Hogan Irwin 3A
Mon Jan 30, 2017 1:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 17695

Re: Quiz 1 Preparation Answers

Can someone please explain why on #5 the answer has 2NH3 on the product side? When I did the question and canceled everything, I divided 2NH3 by 2 so that it would be the same as in the target equation N2H4 + H2 = NH3. This gave me an enthalpy of -105.1kJ/mol, instead of -151 kJ/mol. Thanks I belie...
by Hogan Irwin 3A
Sun Jan 29, 2017 5:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 17695

Re: Quiz 1 Preparation Answers (#11)

How many grams of water can be heated from 25.0 degrees Celsius to 100 degrees Celsius by the heat released from converting 49.7g of PbO to Pb?

The converting reaction is: PbO(s) + C(s) --> Pb(s) + CO(g) deltaH = -106.9kJ

How do I go about setting up this problem in order to solve it?
by Hogan Irwin 3A
Sun Jan 22, 2017 8:45 pm
Forum: Phase Changes & Related Calculations
Topic: Calculating Entropy
Replies: 1
Views: 306

Calculating Entropy

Can someone explain to me why we need the degeneracy value when calculating entropy? How are these two qualities related to each other?
by Hogan Irwin 3A
Sun Jan 15, 2017 4:39 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy Changes (Hess's Law)
Replies: 2
Views: 347

Enthalpy Changes (Hess's Law)

What are the three different methods we can use to find the change in enthalpy?

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