## Week 10 Discussion Notes (2E,2I,2K)

$K = \frac{k_{forward}}{k_{reverse}}$

Chem_Mod
Posts: 18154
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 425 times

### Week 10 Discussion Notes (2E,2I,2K)

Dear all,

Good luck on your finals! ٩(๑>◡<๑)۶

Best,
Joyce
Attachments
Week 10 .pdf
wk10_worksheet.pdf

Meachelle_Lum_1I
Posts: 92
Joined: Fri Sep 28, 2018 12:24 am

### Re: Week 10 Discussion Notes (2E,2I,2K)

Hi, does anyone know why delta H was 300 and not -300 when calculating the reverse activation energy? Didn't they give it as -300, and it's an exothermic reaction so deltaH should be negative?

Tony Ong 3K
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

### Re: Week 10 Discussion Notes (2E,2I,2K)

Thank you so much this quarter Joyce!!!
Definitely the greatest TA to have walked this Earth.

Chem_Mod
Posts: 18154
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 425 times

### Re: Week 10 Discussion Notes (2E,2I,2K)

Meachelle_Lum_1I wrote:Hi, does anyone know why delta H was 300 and not -300 when calculating the reverse activation energy? Didn't they give it as -300, and it's an exothermic reaction so deltaH should be negative?

For the reverse reaction, new delta H = - delta H. The forward reaction is exothermic and delta H = -300, then the reverse reaction is endothermic and delta H = +300.

Hope this helps.

Samantha Silva 1F
Posts: 37
Joined: Tue Feb 13, 2018 3:00 am

### Re: Week 10 Discussion Notes (2E,2I,2K)

Thank you for the worksheet!

Kobe_Wright
Posts: 83
Joined: Fri Sep 28, 2018 12:16 am

### Re: Week 10 Discussion Notes (2E,2I,2K)

Thank You!

Kobe_Wright
Posts: 83
Joined: Fri Sep 28, 2018 12:16 am

### Re: Week 10 Discussion Notes (2E,2I,2K)

Meachelle_Lum_1I wrote:Hi, does anyone know why delta H was 300 and not -300 when calculating the reverse activation energy? Didn't they give it as -300, and it's an exothermic reaction so deltaH should be negative?

Going in reverse, you'd switch the sign around. You're doing the reaction backwards.