Thermochemistry - Free Formula Sheet: bit.ly/3TP4U4u Final Exams and Video Playlists: www.video-tutor.net/ Chemistry 1 Final Exam Review: ruclips.net/video/5yw1YH7YA7c/видео.html
I was stuck for hours on combining equations of formation to make a regular equation and the first 10 seconds of your video enlightened me. God bless you
When you have to learn Chemistry else where because you're under lock down and your teacher won't answer your emails .... btw. you just taught me something is less than 20 mins, which i've been trying to understand for the past 6 days so thanks
I cannot thank you enough for your videos!!! I went and bought some chemistry books but they hardly give any practice problems! You make it much easier and approach problems from different angles, thank you!!!!
I stopped listening during Chemistry lessons cause I literally don't understand my teacher's teaching..I just can't wait to come home and listen to your explanation on this topic...Thank you...I'm now the highest scorer in Term 1 ..Just scored (98/100)...Everyone was shocked..I'm just sad that I discovered your channel late...I'm now in my last year of high school...Should have started watching you from Junior level 😢😢....
Thank you. You are a blessing when it comes to straight to the point lectures. In fact, better than Khan Academy, and teaches way better than my chemistry professor. Just have to search the textbook for a certain topic and then search it on RUclips
Professor Organic Chemistry Tutor, thank you for a step by step explanation of How to Calculate the Enthalpy Change of a reaction using Enthalpy of Formations in AP/General Chemistry. The problem selection for this material are excellent. Every problem in this video also reviews the concept of balancing Chemical Equations in Modern Chemistry. This is an error free video/lecture on RUclips TV with the Organic Chemistry Tutor.
The reason being is that the atoms of oxygen always exist in pairs; that’s why there’s a subscript of 2 in front of O. All diatomic elements are this way (H2, N2, F2, etc). If diatomic elements are always in pairs, how do we get just one atom of it? You would have to multiply the subscript 2 with something to give you one. The only way you would get one atom is by multiplying it by 1/2. Does this make sense? The 1/2 doesn’t mean half of one atom; it is half of 2 which we know is 1. It is another way of writing one atom of Oxygen in this equation.
3:31 for making this more understandable we can say whenever 1mole compound is form then enthalpy of reaction becomes eq to enthalpy of formation and when 2 or 3 etc moles of compounds are form then we have to divide the moles from enthalpy of reaction to get enthalpy of formation.
Great video, I'm wondering though why you don't use reactants minus products in the combustion reaction of c2h5oh, since it's a combustion reaction that includes oxygen. I've learned that combustion reactions are always exothermic, so in this case it brings a negative sign which means exothermic, so I'm good with that, but HOW do I know when to use products minus reactants or reactants minus products? Do I just switch signs if I get a positive value when I know it's a combustion reaction? Little confused here. Thankful for answers.
I am studying for the finals that I will have one year from now xd, this Thermochemistry stuff is one hell of a challenge I am studying on a text book, I also have a few other "note book" things that should help with the text book, I have 50 practice problems, I have like 30 tabs opened, I will watch the mit open course ware lectures on thermochemistry and then I will be done. I don't know why I told you this, but after writing it down I feel a little better :')
For anyone else who wonders, I believe he made a mistake writing /mol and it should just be kJ. If you follow the units of each number on your head, the moles cancel.
Around 9:30 I have a similar question where butane is burned to produce CO2 and H2O. My professor insists that the value for liquid water is to be used in the formula instead of the water vapor one. What I don't understand is why does the value of water vapor not apply to this situation. I don't remember cooking on the butane gas stove with liquid water coming out of it. Any explanation that can convince me?
oxygen is a diatomic molecule, each molecule of oxygen comes as 2 oxygen atoms. it is naturally found this way so you still have to write it that way. its odd and confusing but thats science for you.
This is probably a bit late but it’s -286 because H2O (L) is not a “standard state”, it’s created from the formation of H2(g) and O2(g). So the H2 and O2 are 0 not the H2O
Not sure if this is a dumb question or not but if I have an equation with with no pure element that is in its standard state that equals 0, then how do I find the zero to make my math work? How do I determine what the pure element is if there is none already set up in my equation?
I'm not sure if my answer is correct, but it makes sense to me(if you still dont understand why, just accept it as a given, lol thats what i do when i dont understand a concept). Per mol of the reaction, so depending on the amount of mols located in the reaction we get this amount of enthalpy. but yes, enthalpy is in kJ.
Thermochemistry - Free Formula Sheet: bit.ly/3TP4U4u
Final Exams and Video Playlists: www.video-tutor.net/
Chemistry 1 Final Exam Review: ruclips.net/video/5yw1YH7YA7c/видео.html
I was stuck for hours on combining equations of formation to make a regular equation and the first 10 seconds of your video enlightened me. God bless you
Omg same
literally same
Same here
Bruv if this is the level of physical chem people have in the west every asian would top the test.... its way hard over here!
@@whoKnowsWho27 is it though?
When you have to learn Chemistry else where because you're under lock down and your teacher won't answer your emails ....
btw. you just taught me something is less than 20 mins, which i've been trying to understand for the past 6 days so thanks
This man has been carrying my grades from high school into college lolol
i can relate veeery much
SAME
@Cody Bowie dude that guy is a scammer and a bot
Heck yeah HAHAHAA
Did someone say...... *illegal activity* ?
I cannot thank you enough for your videos!!! I went and bought some chemistry books but they hardly give any practice problems! You make it much easier and approach problems from different angles, thank you!!!!
Best luck all of you for exam tomorrow 🤣🤣
😂😂
Exam today 😂😂😂
My exam is today too
Test tomorrow 😒
Thx I’m totally fcked
No one teaches this as simply as you do. Thank you
I stopped listening during Chemistry lessons cause I literally don't understand my teacher's teaching..I just can't wait to come home and listen to your explanation on this topic...Thank you...I'm now the highest scorer in Term 1 ..Just scored (98/100)...Everyone was shocked..I'm just sad that I discovered your channel late...I'm now in my last year of high school...Should have started watching you from Junior level 😢😢....
Thank god this video exists....
Thank him...but then he IS god
@@degraj418 Woah chill
It's a great pleasure meeting a wonderful teacher make difficult topic more clearer. I now understand better now.
Put it up and God will bless you
Thank you. You are a blessing when it comes to straight to the point lectures. In fact, better than Khan Academy, and teaches way better than my chemistry professor. Just have to search the textbook for a certain topic and then search it on RUclips
I learn here more than in my class
Thank you so much! All of your videos have been a huge help for my first year of pharmacy school. Cheers!
Professor Organic Chemistry Tutor, thank you for a step by step explanation of How to Calculate the Enthalpy Change of a reaction using Enthalpy of Formations in AP/General Chemistry. The problem selection for this material are excellent. Every problem in this video also reviews the concept of balancing Chemical Equations in Modern Chemistry. This is an error free video/lecture on RUclips TV with the Organic Chemistry Tutor.
So glad I waited for you to graduate before beginning this journey. Much love bro. South Florida love
woah I didn't know a 1/2 coefficient was allowed
The coefficient of the product has to be 1 unless stated otherwise, so a 1/2 is required for the reactants
@Megan choo To form water you need one oxygen and 2 hydrogen atoms
Do you like black people?
The reason being is that the atoms of oxygen always exist in pairs; that’s why there’s a subscript of 2 in front of O. All diatomic elements are this way (H2, N2, F2, etc). If diatomic elements are always in pairs, how do we get just one atom of it? You would have to multiply the subscript 2 with something to give you one. The only way you would get one atom is by multiplying it by 1/2. Does this make sense? The 1/2 doesn’t mean half of one atom; it is half of 2 which we know is 1. It is another way of writing one atom of Oxygen in this equation.
@@yabombo8145 what does this have to do with anything?
The enthalpy changes are measured kJ instead of kJ/mol since you multiply everything by moles. Love all your videos btw.
Thanks
Better than my chemistry professor by a mile
Thank you so much ur carrying my grades from 9th grade to 11th grade thank youu so much
Organic Chemistry Tutor The GOAT
3:31 for making this more understandable we can say whenever 1mole compound is form then enthalpy of reaction becomes eq to enthalpy of formation and when 2 or 3 etc moles of compounds are form then we have to divide the moles from enthalpy of reaction to get enthalpy of formation.
THIS VIDEO IS GOLD 🥺🥺
Great video, I'm wondering though why you don't use reactants minus products in the combustion reaction of c2h5oh, since it's a combustion reaction that includes oxygen. I've learned that combustion reactions are always exothermic, so in this case it brings a negative sign which means exothermic, so I'm good with that, but HOW do I know when to use products minus reactants or reactants minus products? Do I just switch signs if I get a positive value when I know it's a combustion reaction? Little confused here. Thankful for answers.
ikr shouldve dlne Reactants - Products in that one its the rule isn't it
Is there a balanced synthesis equation for ethanol, or does ethanol only form through combustion?
Never mind, I found it.
1:31 you have to put graphite because its the main form of carbon (solid) and thanks alot great video
who's studying for finals with me 🥴
Lmao right here
Right here 🥴
Good luck to both of y’all
@@hussnainshakeel2372 had mine. This video saved me on the Enthalpy questions haha. Thanks. Hope your finals go/went well too.
I am studying for the finals that I will have one year from now xd, this Thermochemistry stuff is one hell of a challenge I am studying on a text book, I also have a few other "note book" things that should help with the text book, I have 50 practice problems, I have like 30 tabs opened, I will watch the mit open course ware lectures on thermochemistry and then I will be done. I don't know why I told you this, but after writing it down I feel a little better :')
this guy is a gem
9:19 why is the result in kJ per mol? It looks like it should be for the entire reaction.
That does it. Imma start building a shrine for this guy.
Your tutorials have saved me once again, thank you
Thank you for this! Not many textbooks explain this concept properly.
Lecture Liya b h ya bas comment sy hi Kam chla lia😂
@@tahaprince6978 hi
Please strongly explain to me what is the relationship that connects the heat of combustion with the heat of the formation
You should be my professor!
We have an exam in thermo chemistry today. thank you for making this video. Wish me luck!
Ronn Carl Faminialan how’d u go?
@@milindbordia he probably died
Could you explain why dH(rxn) is -1396kJ PER MOL at play time 9:25. I thought dH(rxn) is -1396kJ for 4mol-NH3 and 7mol-O2.
For anyone else who wonders, I believe he made a mistake writing /mol and it should just be kJ. If you follow the units of each number on your head, the moles cancel.
Around 9:30
I have a similar question where butane is burned to produce CO2 and H2O. My professor insists that the value for liquid water is to be used in the formula instead of the water vapor one. What I don't understand is why does the value of water vapor not apply to this situation. I don't remember cooking on the butane gas stove with liquid water coming out of it.
Any explanation that can convince me?
Yeah there is explanation
Just don’t think too much
You are the best man🙏king
A PRODUCTIVE VIDEO....KUDOS TO THE TEAM
Thanks alot bro, it make's easy to understand thermochem
Absolutely Brilliant 👏 👌 Thank you so much 😊
Thank you so much for this!
Another great video. Thank you!
Thank youuuu this is so helpful
Why am I watching this? It's 2 minutes to midnight and I don't even go to school anymore!
Well explain and easy to understand
Thank you very much man you're AMAZING
welcome
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He's the best
Thank u so much good job keep going.
May I ask how is it possible if we undergo combustion raction while still staying at standard condition (1 atm, 298 K)?
What about calculating the enthalpy change of formation if given the enthalpy change of combustion?
Enthalpy change of combustion is enthalpy change of reaction
And to solve for that is
∆Hproducts - ∆H reactants
you can use algebra and finish up
@@hectorokereke9268 thank you
How do i know if the product is gas liquid or solid?
What is the balanced synthesis equation for ethanol?
Never mind, I found it.
Thank you for such a great video :)
you are the best dude!
Yato gang?✌️
Thanks you soo much brooo made my life easier
thanku sir.....awesome lecturing
Thankyou so much for the awesome videos!
You explain things so well. Are you a TA or prof or something?
Thank you so much sr.You save me from failing the exam.😞
thank you. thank you. god bless you.
Why wouldn't your units "mole" cancel out when solving for the heat of reaction? I think it should.
Beautiful video. Nice job
2:01 Anyone know why there is a 2 after O? Why can't he just write O so that he does not have to put 1/2 in front
oxygen is a diatomic molecule, each molecule of oxygen comes as 2 oxygen atoms. it is naturally found this way so you still have to write it that way. its odd and confusing but thats science for you.
Question:
Enthalpy of formation of H2O is 0 or -286? What do I miss?
Thank you!
This is probably a bit late but it’s -286 because H2O (L) is not a “standard state”, it’s created from the formation of H2(g) and O2(g). So the H2 and O2 are 0 not the H2O
If I am not given the KJ/mol of the compound how and I supposed to figure out the heat formation of a compound?
Thank you. This is great!
Learned a lot
I wish I could know which grade this lesson is for, bc I am taking it in high school second grade in Saudi Arabia, and thanks man for this video ❤❤
16:15 isn't supposed to be +552 not negative?
-856 = -1408 - 6x right
552 = -6x
divide both sides by -6
x = -92 kj/mol
I have an exam tomorrow and I still don’t understand Heat of Combustion 😀 wish me luck before I head to my certain doom!
you've saved me for tomorrow
Do you only put elements on the reactants side?
will the carbon dioxide and water formation enthalpy always be the same for problems or does it rely on the textbook
THANK YOU SO MUCH! CAN you make for heat of combustion please...
my goat 🐐
ohh man you are awesome
Not sure if this is a dumb question or not but if I have an equation with with no pure element that is in its standard state that equals 0, then how do I find the zero to make my math work? How do I determine what the pure element is if there is none already set up in my equation?
It’s second period and my test is fifth period, wish me luck 🥴
How did your test go?
So,how do I figure out that sodium chloride is a liquid?
how can this piece of flesh can teach that amazing !!
What would happen if Aluminium had a value (hypothetically)? How would you isolate X ?
life saver !
Good one sir.
But how to I find enthalpy changes with enthalpy of combustions
This guy sounds like Mark Whalberg
yess thats what i thought too
my goal is to fulfill my purpouse in life to the same degree you have fulfilled yours
Why is the enthalpy change of the reaction is equal to the enthalpy change of the copustion of 1 mole
thankyou so much.........
Thank you.
people how did he get -552 at 16:15. i tried divide the 856/-1406 but kept getting 0.60. can someone explain to me if i misunderstood pleeeeaaase
Why would you divide? You have to substrate.
-856= -1408-6x
6x= -1408+856
6x= -552
x= -552/6 = -92 kJ/mol
This is so easy.
Sir how to find the value of reactants and products ??
Sorry, I thought that the unit for change in enthalpy is kJ, then kJ/mol for heat evolved.
Please explain
I'm not sure if my answer is correct, but it makes sense to me(if you still dont understand why, just accept it as a given, lol thats what i do when i dont understand a concept).
Per mol of the reaction, so depending on the amount of mols located in the reaction we get this amount of enthalpy. but yes, enthalpy is in kJ.
@@SB-qh6cr Thanks
he just forgot that once he multiplied by the coefficients the mold cancel out
Thanks 🎉
Shouldn't the final answer be in KJ not KJ/Mol since you multiplied the Molar Enthalpies by the moles in the equation?
thanks for this video
Why use O2 instead of O in #1?
Oxygen is a diatomic element. In it's natural form, it's written O2. It's the same for hydrogen, nitrogen, fluorine, chlorine bromine, and iodine.
333K views. 3 years ago
Nice ❤️
Its 8:36 and my test is at 9:20 wish me luck 🥲
where did the -856 kj/mol come from?
It was given