Chapter 15 – Chemical Equilibrium: Part 7 of 12

In this video I’ll show you an example problem that involves combining multiple reactions’ Kc values to get an overall Kc value for a more complex reaction.

[lilaliluye]

OMG, ..how come I'm only stumbling on your videos just now??? This is gold, ...you're saving my life. Thank you Mike Christiansen.

[ovocow]

First person I've seen on YT that actually works out problems thoroughly like this for an entire unit!! What I love most is the fact that you let us see your thought process on attacking these Chem problems. THANK

[MrJESUSGARCIA]

Hey thanks for the great videos. Question in minute 3:30 when you put 1/(3.8*10^-6) is that the same as just putting -3.8*10^-6 that's what my teacher does, so I guess is the same just making it negative?

[CoachMiguelW]

Most excellent stuff here. :) Thanks! 

[stephaniemartinez]

Hello, hopefully you can help but I have a question regarding this type of problem.

Say the overall equation is 2N2O + 3O2 --> 2N2O4

and one of the given smaller equations is 1/2 N2 + O2 --> NO2

how can I get O2 to be 3 and what would I do with 1/2 N2 and NO2 if they arent in the overall equation?

SORRY I'm desperate for help in understanding.

[kaylagraceohalloran]

I was wondering can you please post the answer. I want to make sure I am putting it in my calculator correctly. I got 1.75 * 1o^16.

Thank you so much for your help! wish i found this channel sooner

[jademargolis]

Your videos are seriously awesome. Everyone from my school uses them. Thank you for explaining so clearly and taking your time to help out some AP chemistry students!

[hysmith]

I love your channel so much!! Your deliverance is understandable and allows me to walk through problems at my own pace. I hardly understand what is being taught in my lecture, but I really understand the material after I watch your videos. I was hoping you can help me on a problem I am working on:
HbO2(aq)  +  CO(aq) <->  HbCO(aq)  +  O2(aq)  

Hb(aq)    +  O2(aq) <->    HbO2(aq)    Kc=1.8

Hb(aq)    +  CO (aq) <->   HbCO(aq)    Kc=306 
b) Suppose the air mixture gets polluted with CO at a level of 0.15%. Assuming the air contains 20% oxygen and that the oxygen and CO ratios that dissolve in the blood are identical to ratios in air, what is the ratio of HbCO to HbO2 in the bloodstream? Using this information comment if CO is toxic?

How would I solve this problem?