How to Calculate Atomic Mass Practice Problems

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How do you calculate atomic mass? You have to multiply the atomic weight of an atom (in amu, or atomic mass units) by the percent abundance expressed as a decimal. Then you add these together for all the isotopes of an atom.

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2 окт 2024

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Комментарии : 344

@nineteen96 8 лет назад

For the first time in my life someone just explained what "respectively" meant

@tajdeedl-ilm2258 5 лет назад

Keep going. Stay awesome

@tropturd6458 4 года назад

@John Tillman Harsh but I like it

@latachakraborty3000 4 года назад

🤣🤣🤣🤣🤣

@fredericsimeon6625 4 года назад

Didnt think it needed explaining lol

@prequelanimations539 4 года назад

same

@savagegamer2754 8 лет назад

until I'm finished school, then you have my permission to retire

@tropturd6458 4 года назад

It's been 3 years. Wazzup?

@stxclout3247 4 года назад

Wubba Lubba Dub Dub what’s up

@tropturd6458 4 года назад

@@stxclout3247 the ceiling

@d.b.coopers.strongest.soldier 4 года назад

Thank you Savage Gamer, very cool!

@markn.7914 4 года назад

Done yet?

@PureSkySprinkles 9 лет назад

You teach better than my chem teacher -_- lol seriously I don't know what I would do without you man thanks

@sarahtovar9924 5 лет назад

Sparklify how’s college?

@devv0073 3 года назад

@Kalep Houston i need help on this stuff now🥲

@adrianramirez4048 3 года назад

6 years ago... heres me, a sophmore

@adrianramirez4048 3 года назад

@@sarahtovar9924 hows senior year?

@PugBella 3 года назад

I agree👍

@coasterguy1000 8 лет назад

So...who else is here for midterms

@MollyIRLYouT 8 лет назад

+coasterguy1000 I have a science exam today at 12:00. Last minute studying.

@dtalmood 8 лет назад

+MollyIRL danm son

@claribelonisamenacagarcia7072 7 лет назад

Аreе Yоu ОOООn Тhе Раth Tо Ultimаte Lifе Suссеss? twitter.com/380ae3e0665a7c714/status/804630629388152832 How to Calculаteее Аtоmiс Мass Рractiсe PРРrоblеms

@Jenny98IFLY 7 лет назад

***Finals lol

@ososkashmar 6 лет назад

@lunak6043 6 лет назад

HOW CAN IT BE THIS EASY WHEN YOU EXPLAIN IT?! Thank god there are people like you that exist xD

@jasperrester2264 10 лет назад

with you and the Khan Academy doing homework is a whole lot easier :)

@tiarutherford493 7 лет назад

I agree

@tdewitt451 11 лет назад

Hey everyone, I'm here to help. If you have any questions or just want to learn more, click on the link in the description above. It'll take you to a page where you can ask me questions.

@lxverxse3663 9 лет назад

A mole of thanks to you ❤️

@lanashin2312 9 лет назад

so true

@mikeediaz7096 5 лет назад

H A H A

@waynevalentin6789 5 лет назад

Kick my ass mole

@waynevalentin6789 5 лет назад

Kick my ass mole

@muskansiddikee2171 5 лет назад

602 haxillion love to your channel

@kuntakinte1416 4 года назад

finally someone that teaches in detail and doesn't mash problems up like play dough as if we're all college proffesors.

@japansportscardscollecting8349 17 дней назад

Love your spelling there, masher

@yahyabello9332 9 лет назад

Ur explanation is just so clear and straight forward... More videos on different Chem Topics plz. Thnks so much!!!

@thewaifupillow 9 лет назад

This was super helpful! I didn't understand this earlier in the semester and shrugged it off but now that I have the ACS exam, I decided to finally conquer this and I'm glad I did. :D Keep up the good work!

@adachung4012 10 лет назад

Tyler, you are the BEST. I am doing distance learning. Watching your videos is like I am going to classes. Your way of teaching is straight forward and simple. You are really Godsend !! Thank you.

@k1ll_3r33 4 года назад

how was distance learning available in 2014 tf??

@captainnootnoot0695 4 года назад

Homeschooling is so much easier thanks to your videos.

@MP-wd5sk 7 лет назад

Best teacher man. I wish he taught at my school.

@jorgeaarmenta7817 3 года назад

I know right those finger movements are hot af

@muratferiz3573 11 лет назад

I am taking online chemistry class and it is pretty hard to understand it without an individual teacher. I dont even have a teacher that can teach me from TEXTBOOK! Thanks a lot for making these videos. They are really useful. P.s: I used to study in turkey and failed chemistry but now I am getting "A"s and "B"s.

@Beyza-cv9tl Год назад

8 yıl önce türk birinden böyle bi yorumu görmek şuan nerdesin ve ne yapıyorsun çok merak ettim

@haris.9970 4 года назад

If we already have the periodic table, then why do we need to do all this work? Can someone explain?

@sorasgirl0 8 лет назад

YOU. ARE. AMAZING!! I shared you with my chemistry class. You are very helpful, energetic, easy to understand, and you make chemistry much less painful! Incredible teacher, anyone who learns from you should consider themselves lucky!

@elizabethcalimag3907 7 лет назад

Numbеr 1 sесrеt to mаaanifеst yоur dreаm lifеe => twitter.com/18e785b1da2600196/status/804630629388152832 Hоw tо Cааааlсulаtее Аtоmiccсc Маss Prаctiсе Prоblems

@kingolas4676 7 лет назад

@nullvoid6083 4 года назад

Please stick with me as I stay this one year in chem, you are my secret weapon ✊

@shailsinghsaloni9266 4 года назад

Hey, I am from India...... U r doing great

@charlizemorton2516 7 лет назад

This was a great video! It really helped me to understand the concept and I hope it helps me do well on my chemistry test tomorrow!

@kelseyt4071 3 года назад

I appeciate you so much. You're a life saver and thank you so much. I hope you have the best day ever. I love u

@SaurabhKumar-vs8nv 4 года назад

Very very thankful sir you are amazing and also your teaching style

@ball1stic937 8 лет назад

i really love your way of teaching.... learned a lot of things from your vedios

@safees3165 9 лет назад

dude you are awesome, I hope you keep making videos!

@falakleghari8918 3 года назад

Thank you much i am from Pakistan now my concepts is clear🦋❤

@meganhenry5795 7 лет назад

Tyler! Thank you for your videos! You are helping me get through chemistry.

@CrackBoys007 2 года назад

i never had a good chemistry teacher and even if i had their chemistry teaching methods were bounded to their own circle and i couldn't reach their man hehehehe

@27capricia 10 лет назад

God bless you Mr. DeWitt. words could not express my gratitude, How about "a mole" of thank yous :-)

@annetteabram5452 7 лет назад

Your amazing, I haven't taken chemistry in over 10 years, was helping my niece with her homework and this was so helpful. I was able to help her better understand with your tutorial an easier way of solving the problems than what her instructor was showing them.

@japansportscardscollecting8349 17 дней назад

Let's hope that you don't help her with her English grammar homework.

@lpsenderart 2 года назад

So helpful. I've had to miss a few chemistry classes for choir and I was stuck on this until I watched this video. Thank you for making this video!

@BillQuattlebaum-r9z Год назад

Tyler, I am a substitute teacher with minimal chemistry knowledge, but I try to keep the class engaged and learning. Your videos are going to become a very large part of my routine. I am turning the kids onto you tomorrow. Thanks for all your work. You are great and my kids will not only benefit from your teaching...they will know your name and where to go to find understandable chemistry instruction.

@japansportscardscollecting8349 17 дней назад

If only teaching was as easy as showing the kids a video.....I could just kick back and drink my coffee and cash those checks.

@undersc0r 2 года назад

Where would I be without this man

@mr.krusty3739 4 года назад

do i have to memorize the exact atomic mass for each element or am I fine just getting the rounded off number?

@amsa12378 4 года назад

you don't need to

@muslim588 10 лет назад

plz make a video about how to caculate binding energy.

@yuijones 11 лет назад

You just saved me an 8pts question on my exam! Thank you!

@violet9950 4 года назад

you rock :D

@jennym732 9 лет назад

You are very good at explain things, keep it up.

@wmedinaful 8 лет назад

Thank you so much Tyler!! I'm finally enjoying chemistry because you make it so much easier to understand. You are my teacher😘

@kaciehasting1838 9 лет назад

Just wanted to say a little thank you, this actually really helped me on my Chem homework. You taught it better than my teacher

@bryanstevensceronmontoya6019 3 года назад

Awesome video! thanks a lot :)

@danieldelatorre6907 9 лет назад

You my friend are getting me through chem..... you make me seriously hate my teacher lol thanks for explaining so clearly !

@alishim5663 9 лет назад

You are amazing at explaining problems that I'm having trouble with

@Ibra_SZN 2 года назад

Thank you for making these videos! You deserve 100 Million subscribers!

@fatimatalpur1427 7 лет назад

Thank you so much Tyler Dewitt you are awesome and fantastic professor of chemistry you teach in easier way now i only watch your chemistry videos can you make a video on what is atomic mass unit

@lasandichamathka1904 3 года назад

I watch your videos because I couldn't understand when my teacher teaches. That itself shows what an excellent teacher you are

@sophie20001 9 лет назад

you explains things so well! thank you!!

@colorfish3559 7 лет назад

Wow you explained this beautifully ^-^ Just watching these videos once is excellent review and will help me tremendously for my quiz! Thank you for making these!!!

@hajaralmansouri2703 12 лет назад

I really want to thank you from my heart I have exams and the Dr. does not explain anything T^T I really want to thank you and never stops Pleas cover all general chemistry , general physics and organic chemistry I am a chemical engineering student and I really need your help

@kungninja3052 4 года назад

you are such a good teacher :)

@htoWn 6 лет назад

Now amu is abbreviated as u sir. Ur method is cool.Nice explanation.

@gamerloud7416 8 лет назад

Thank you very much for your lessons sir. If you can consider, Equilibrium and Energetics please!

@samuellechisa5647 5 лет назад

please upload another vedio about quantum mechanics ....your expaination very very clear...god bless you...

@MsClara-jt5eg 6 лет назад

Bro. Can I marry you? 😂😍

@podstheking957 7 лет назад

You might be the goods at chem, but you no Walter.

@sadyetdrowsy493 4 года назад

Why 24.30 popping out in my answer in the magnesium HAHAHAHHA my ghad

@nicegems7347 6 лет назад

Thanku sir ...such a good explanation ...all the basics are clear now.....nicely explained sir ...u are indeed a great professor ...

@javiersiverio2927 4 года назад

Not all heroes wear cape

@youssefelaziz6101 8 лет назад

the title of this video should be " How to Calculate Average Atomic Mass Practice Problems" not "How to Calculate Atomic Mass Practice Problems"

@christaletjohn3176 4 года назад

The formula is (mass of 1st isotope×%abundance of 1st isotope) +(mass of 2nd isotope×% abundance of 2nd isotope)

@codosacho5924 9 лет назад

I really didnt get what is the use of all these and what did i benefit from knowing the average atomic mass and how can the abundance of an isotope affect it ?

@DiZambrano51 4 года назад

is it always two times to the left??

@haris.9970 4 года назад

Yea

@domvenjames2060 4 года назад

To be honest with u bro u are good...especially that balancing chemical equation ,know I can balance anything type of chemical equations ...really appreciate man 🙋🙋

@youtubeaccount0x073 5 лет назад

You didn’t explain why we multiply by the percentage abundance, I know you usually explain the process which is why I came here...

@yuichisato7879 7 лет назад

first viewing: for educational purpose. second viewing: staring at his ridiculously awesome hair

@ChigozieloveAmaka-dy8qu 10 месяцев назад

Good day sir, I’m watching you from Nigeria 🇳🇬 please discuss hybridization 🙏🏽 I have trouble understanding it.

@naseebkhan6551 3 года назад

out standing explanation sir Ur explanation is just so clear and straight forward... More videos on different Chem Topics plz.

@rekibaahmed8209 4 года назад

Nice bro 😙😍😍🤗

@umeshbhattp 5 лет назад

sir, you are very good teacher !!!!!!!! the above last example. Are all " three multiplication / by 3 " sir ?????

@maheshmahendrakar6449 5 лет назад

Lol! At 3:35, i paused the video and without using any common sense, I did the whole process and then concluded that Rb-85 is more abundant.

@agniezkalumbangaol1063 3 года назад

alternatively, you could just multiply the mass and abundance in percentage form for both isotopes and then divide the equation by 100 at the end

@chreif 3 года назад

your videos are excellent. congratulations and thanks...I'm sure you save many lives (grades) of students

@yaboi2964 3 года назад

I’m sorry for yelling at your videos when really I was just frustrated with myself. Your videos are very helpful thank you

@jaytee5000 4 года назад

On the last problem I ended up with 24.345 and I can’t figure out what I did wrong

@naomikychiu98 10 лет назад

Thank you for these videos, it helps me review and when i don't understand something in class i learn what i miss here

@isaacccc10 6 лет назад

Would the answer of the problem be based on significant figures or decimal places?

@dinosanchez8528 2 года назад

Wow, i haven't studied chemistry for a while, decided to start again. I used to love tyler DeWitt he was my favorite. Still is.

@aribkamal3239 8 лет назад

Never ever consider a person with blonde hair a "Dumb Blonde". This man can replace a teacher.

@joey7409 8 лет назад

I hope you weren't at the gay club in Orlando because I need your tutorials. Too soon sorry I'm a douche bag smdh

@aftabhassan1905 7 лет назад

Sir i do have a question that in the past times when these brilliant scientist doesn't have any sophisticated equipment then how they did find the atomic number and more importantly the atomic masses of atoms.

@sofiabulimwengu390 7 лет назад

i had an exam and i was not understanding these stuffs but after i watched this video i will be confident in exam room....thxs so much sir

@pradeepkumarbhagat2617 6 лет назад

Sir I am studying in 9 class and I have to calculate the atomic mass of 118 elements what should I do because I

@Ben-ki8ml 9 лет назад

So what if the problem doesn't give you the amu? How would you figure that out?

@wibibscoco9844 2 года назад

Thanks alot my finals are in almost a week:'') ur videos are saving me!! best teacher everr

@nicoledearmas130 6 лет назад

What happens to the sig figs, I get the wander but the when it comes to rounding off the answer :( someone help

@mogaumakua5013 2 года назад

Khan Academy and u are the best teachers more than mine. Mine explains as if we are collage students or teachers

@pullingthestrings5233 3 года назад

So why not just look up the mass of gallium on the periodic table instead of doing all this math

@KriaKumresh 6 лет назад

you are wrong in the last problem the answer for the numbers you have given is 24.30 and not 24.31 you have not calculated the numbers you have used you are just telling out the answer because it is there in the periodic table.First you have to calculate your viewers are believing you and you can be one reason for losing the mark

@tdewitt451 6 лет назад

No sir, you are wrong. When the arithmetic is performed, the final answer is 24.3050789. The final answer should be rounded to 4 significant figures. There is a 0 in the hundredths place, that rounds up to 1 because there is a 5 to the right of it. 24.31 amu is the correct answer. Every time I do a calculation, I do it many times before to make sure that it is right. I would suggest that you do the same.

@khushiagrawal3996 3 года назад

sir it is really meant to say that it was great ease for us now by your conceptual intro. to it Really loved it ..

@gaming_with_rex4031 3 года назад

I went to hit the subscription button then realized I was already subscribed hah

@KaliforniaKelly63 9 лет назад

That was brilliantly shown! Thank you so much - I needed a refresher!

@botlhalebakwa9364 3 года назад

Oh my God dude, thank you so much. you don't know how much you're helping me

@Maddiecat1334 Год назад

Bro why do I have to spend the seconds of my lifeforce calculating atomic mass when I can just look on the periodic table!? This is just a waste of time! No hate to you though Tyler great video bro.

@nwakegoblessing 11 месяцев назад

Would you use the periodic table in exam

@imilya1814 7 лет назад

Can you traduce them in arabic .please because i can't understand some thing

@rhetthart9311 2 года назад

Tyler thanks a lot I have a quiz on this tomorrow I am eternally grateful

@karenhidalgo4384 9 лет назад

How do u calcualte the average of atomic mass of europium is the same thing ?

@Akemteu_Aichetou 9 лет назад

thank you with this your explanation because it is clear like a Cliff water

@1TopGunPaintballer 9 лет назад

Exactly what I am looking for. Thank you. You also make it clear and explain what is going on with where the numbers are coming from and so fourth. Thank you again.