How To Calculate Relative Atomic Mass | Chemical Calculations | Chemistry | FuseSchool

[@Ayaanbs7]

Anyone on 2024 😂

[@fuseschool]

We still here :)

[@KaraLacuna]

i may be wrong but i have found a rounding error as 23797.8 divided by 100 is 237.978 which rounds to 237.98 not 237.99

[@fuseschool]

When you are rounding to 2 decimal places, you need to see what number the 3rd decimal place is. If this 3rd decimal place is 5 or higher, it will round the second decimal place UP. So looking at 237.978... the 3rd decimal place is 8 which will therefore round the 7 up. So to 2 decimal places, this number rounds to 237.98. Whereas if it had been 237.974 then the number would round to 237.974 because '4' is less than '5' and so does not round the second decimal place up. I hope that helps!!

[@KaraLacuna]

but what you have just stated is what i was saying about your rounding error in the video

[@fuseschool]

Sorry!! I didn't watch the video - I misread your comment!! You are completely correct - it should round to 237.98.

[@KaraLacuna]

FuseSchool - Global Education then this would end up changing the rest of the equation, right?

[@usmanriaz5310]

he round it

[@Iuliica]

I am really sorry but one of your URANIUM calculations is wrong. 99.27 x 238 =23626.26 and not 33626.26 as stated in the video.

[@fuseschool]

Hi Lulica! You're absolutely right, this is an error on our part. Sorry we didn't notice this sooner and thanks for bringing it to our attention. The actual calculation is still correct, it's just the first figure was typo.

[@dipper556]

Thank you so much! I'm finally getting some hope for my exam.

[@javeriamubasher956]

And when u multiply atomic mass of uranium 238 to its abundance 99.27 then the answer you got is 33626.26 while the correct answer is 23626.26

[@RameshKumar-bg3to]

Sir u have made a mistake in calculation in uranium calculation 238*99.27=23626.26

[@biscatt]

Ramesh Kumar thank god someone else noticed I have been sitting here with my calculator so confused by the maths

[@fuseschool]

Yes, you are right. Thanks for noticing!

[@sputnikspacecraft]

@@fuseschool after 4 years nice

[@tianaqueen3007]

Same, cause I had to calculate it over and over to see 👩🏽‍🦱

[@tahmid6117]

Yeah I was confused

[@matthewdunkerley6581]

I had this exact same question for chemistry. Thanks :)

[@farisk8988]

How do you know the percentages already?

[@shaileshs6862]

They are the percentages of that element's abundance. Six years and no replies other than me😶

[@ibentlempengesi]

@zakaria75 im here as well

[@adrictrlx]

@zakaria75 now theres me

[@jufref]

Hello dead person I am pretty sure they give you the percentages in the exam

[@zehrameer]

You are always given the abundance in the exam either numerically or in the form of a graph, you don't have to memorize it.

[@dualtapestry1197]

This video cracked out my concepts ti max..... Thank you broooooo

[@faraha.t8430]

than you so much for explaining it was great and better than any of my teachers

[@his_fye]

hey hey now...no need to be rude

[@Sangeetsadhana_sprituality]

Hi can we be friends please

[@kmk1225]

Thank you for this easily understandable and practical video!

[@jackradford801]

This was very helpful😄 Love the accent by the way😉

[@fuseschool]

Thank you! 😃

[@surfdanceroceana6297]

Thanks for the clear, forthright explanation and charming British dialect!!

[@jameelalmuti]

that sentence makes you sound like a prat

[@3li.735]

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[@omarbaseer5587]

i have an exam in a day. i was confused . this vid really helped clear everything up :)

[@fuseschool]

Hope it went well!

[@marizfahim6002]

thank you you just save my day

[@vd6573]

Thank you so much. This helped me a lot and finally I understand. Great explanation!!!

[@fuseschool]

You're very welcome! Glad you liked it 🙂

[@zabirkazi7262]

Ur the best teacher ever

[@fuseschool]

Aw thanks! Glad you think so!

[@eliseesile4966]

3:05 99.27 x 238 is 23626.26 not 33626.26

[@kelvinozor-muogbogu2628]

Thanks for this easily, understandable and diluted video.

[@zislaslimeyt136]

That was 100% percent better than my teacher btw I am using my sisters account

[@hawaabdullah7102]

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[@ginakwon7433]

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[@fuseschool]

No problem 🙂

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information was clearly brought across

[@sabayewsufxai2094]

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[@sishiisishii5887]

Thanks 🙏☺️u just saved my life

[@fuseschool]

Yay! Happy to help 🤗

[@elisalopez8221]

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[@fuseschool]

Glad to help

[@shifashaikh9234]

Thank you sir❤❤❤

[@fuseschool]

Most welcome!

[@shivnanda4644]

your teaching style was insane

[@Jty734]

Totally agree

[@mfahad1569]

Thank you so much

[@cleggmichael5786]

Thank u so much for helping me I love u🤗

[@fuseschool]

You're welcome 😊 happy to help!

[@aaroniglesias5567]

This saved me thank you!

[@gabriellaletang6211]

Thank you so much, It helped a lot

[@fuseschool]

You're welcome! Glad it helped!

[@TheChefthatcooks-sjwcew]

Hey, great video but one thing that is bugging me is how did you calculate the abundance of chlorine?

[@gunakusal8321]

your work is really straight forward and does not confuse me. may god give you a lamborgini avantedor with a 24k iphone and a house key worth a billion dollars thank u

[@fuseschool]

Wow! Thanks a lot! 😄

[@nothandoonyehalu7966]

Great explanation

[@rosina29]

Ahhh thanks u helped my revision 💖💖🥳

[@fuseschool]

Excellent! Glad to hear that!

[@tamarahector2365]

Thank God for this video

[@aktilek5308]

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[@fuseschool]

Glad it was helpful!

[@ceering99]

Gonna subscribe for later use, hopefully I'll do better on my chem. test now.

[@Hubcitycrypto]

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You are so welcome 🤗

[@saadsajidul9001]

Thank you sir

[@chandiavicky8308]

I have found reall solution I had for group work

[@Aisyah-qf2pz]

Thank you!

[@fuseschool]

You're welcome!

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I 💜 this video.

[@belaluddinchowdhury3611]

good

[@awsomeseba]

Thank you for the help

[@USMANGHANI-uo2wj]

is really very helpful

[@fuseschool]

Thank you! Glad to hear that!

[@legendfaiax5559]

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[@fuseschool]

Glad it was helpful!

[@usmanriaz5310]

THANKS A LOTTTTTT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@ammargondal5416]

How to find of hydrogen

[@gunakusal8321]

Cool your work is really helpful thanks bruh

[@fuseschool]

No problem! Happy to help!

[@kristelmarasigan5756]

i just want to ask, the uranium part, whenever im trying to add all of the products i'm getting 33797.8 rather than 23797.8??

[@fuseschool]

Hi there! There is a mistake with the first multiplication at 3:12, it was supposed to be (99.27 x 238) = 23626.26, and not 33626.26 Sorry about the confusion!

[@shoaib808]

As stupid as it may sound but since I am preparing to lecture kids and they might ask this question which I don't have the answer to.. How have scientists/Chemists been able to tell the exact percentage of Isotopes of a particular Element? Like with Cl there are 27%Cl 35 and 25% Cl 37? and Others..

[@theramblingreviewer5150]

I was wondering the exact same thing. It's probably not an exact estimate, but an average over many different environments. So, they probably take samples from one place find the percentage, go to another place find the percentage and do this a hell of a lot of times until they have an average. That's just a guess though, perhaps I am wrong.

[@parttimeart1073]

Like i understood the whole topic in just 3 min It was soooooo helpful thankyou so much Please upload more helpful science vedios😊

[@fuseschool]

Glad it was helpful!

[@parttimeart1073]

@@fuseschool 👍

[@jesseokorom2889]

Is there a way to work it out without the abundance’s?

[@suvankarrana7868]

Now I came to the point and I understand and I hope I will do well in exam

[@fuseschool]

Best of luck!

[@huz653]

didn't get any of them right, thank you btw

[@InnovaCraftsByVanshika]

Well explained🐂

[@fuseschool]

Thank you!

[@chanukainduwaraprabasha8977]

Thanks

[@CallmeTonyI]

Thank you my braddah😂 no but frl thanks, made this easier to understand somehow☺👍

[@fuseschool]

No problem 👍

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Glad you are here 😉

[@chrscrn219]

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[@fuseschool]

Our pleasure 😊 we're happy to help!

[@anaconda470]

I'm very sorry to point that out but this is not entirely accurate explanation. It could be easily verified by comparison to the Periodic Table data. Using method you presented I got chlorine relative atomic mass 35.50. Periodic Table says ~35.45 You cannot simply add nucleons and multiply them by abundance in Earth's crust. When protons and neutrons combine to form atomic nucleus a small part of mass is converted to nuclear binding energy. However, we cannot predict the amount of nuclear binding energy just by counting the numbers of protons and neutrons. It must be experimentally determined using a mass spectrometer. (source: www3.fed.cuhk.edu.hk/chemistry/atomic_mass.html)

[@Hanan_Khan_Cryp]

In relative atomic mass, we measure the mass of an atom using C-12 as reference. So why are we using a formula to calculate the atomic mass? Also what is the difference between average and relative atomic mass?

[@fuseschool]

Relative and average atomic mass are closely related. The relative atomic mass is assumed to be correct for most of the planet Earth's crust and is a standardised number. An average atomic mass is only true for a given sample, as this number can vary over geologically long periods of time and certain processes which change isotopic ratios. sciencing.com/calculate-subatomic-particles-8221603.html

[@momeristic817]

3:08 I'm sorry I keep getting 23626.26 not 33626.26 how'd you do it please

[@fuseschool]

You are right! The end result at 3:12 is correct; but the first multiplication isn't, it was supposed to be (99.27 x 238) = 23626.26, and not 33626.26

[@sadiaabad6416]

Thank u sirr

[@fuseschool]

You are welcome!

[@annashields8329]

Thanks this really helped but what if the total isn't always 100, then what do you divide it by?

[@fuseschool]

We divide it by 100, because the abundances of isotopes are given as percentages (%) 2:35

[@zislaslimeyt136]

Also, does this method work for three isotopes? Thanks

[@aaravgupta6902]

yes?

[@purnimasaha3037]

How do u know the percentage from before only??

[@moona202]

Hi i know im super late but do you think by any chance you can show how to find percentage for relative atomic mass? like if it shows you the atmoic mass not but percentage

[@rajeshambastha7719]

Great

[@killer_arzz7474]

LEGEND

[@mayag7120]

this was super confusing to me because i was taught to make the percentages into decimals BEFORE you multiply them by the mass number, and honestly i think it's probably easier that way.

[@narayananramesh1411]

What is relative atomic mass of an element? How it is related to atomic mass unit? (Can anyone say the answer for this)

[@aliciasheridan1477]

sorry but the finding the average atomic masses part is actually wrong. it is .75x35=26.25 and .25x37=9.25, added which equals 35.5.

[@aliciasheridan1477]

oh lol never mind he just explained the correct answer right afterwards. :')

[@alizafar3144]

after decimals it is pronounced "nine nine" not "ninety nine"

[@harrison1153]

take ur silver spoon out of ur fucking ass

[@BartokandBadIdeas]

I really thought this was being voiced by James May for the first 6 seconds

[@agentsneakycp4681]

at 1:19 your subtitles are wrong

[@fuseschool]

Thanks for noticing!

[@karthikbs9015]

Sir, ur calculation of 238*99.27 is wrong .i got the answer of 23626.96, but u got some other answer

[@fuseschool]

Yes, you are right. It should be 23626.26

[@tirogiro]

is relative atomic mass and average atomic mass same?

[@fuseschool]

No, they are not the same thing. Relative atomic mass is the usual term for the atomic weight of an element in its natural state (average of isotopic masses). Average atomic mass applies to a specific sample - e.g. lead ores which derive from different decay chains of previously radioactive elements have different average atomic masses because their isotopic ratios are different - and you can tell from where a lead sample was extracted from the average atomic mass of that particular sample. In other words, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.

[@frankpires7324]

i got it right

[@shabih1356]

At 1:22 how did you know that chlorine 35 is 75% and chlorine 37 is 25%

[@fuseschool]

There is a clever machine called a mass spectrometer which fires individual charged atoms (in our case it is chlorine ions) through an electromagnetic field. The higher the charge on the ion, the more it gets bent round; and the more massive it is, the less it gets bent in the field. In this way we know that naturally occurring chlorine is made of 25% 37 and 75% of 35 giving it an average atomic mass of 35.5

[@musa2908]

just a question but I did 99.27 x 238 and got 23626.26 and he says its 33626.26 anyone help? also at the end its a different answer than when I add them all together plz someone explain this to me

[@fuseschool]

Hi there! There is a typo in the first multiplication at 3:12, it was supposed to be (99.27 x 238) = 23626.26, and not 33626.26 Sorry about the confusion!

[@musa2908]

@@fuseschool no problem thanks for clearing that for me I was really confused after that part

[@raashidjournalist2324]

thnx

[@fuseschool]

No problem

[@lexi67436]

1:31

[@JP-ue4jr]

Is this for gcse?

[@fuseschool]

Yes!

[@arhaanfawaaz8628]

I guess there is a mistake in calculation (uranium calculation) 238*99.27=23626.26 ...plz cross check it once.

[@fuseschool]

Yes, you are right!

[@itzmuqi2638]

On the example you calculated the sum incorrectly it was 23626.26 not 33626.26

[@fuseschool]

Yes, you are right! Thanks for noticing!

[@tinkerbell2264]

I hope you know you're a life saver, I got some ap chem homework due today and it's still not done 😅😅

[@fuseschool]

Hope it all went well!

[@dom4308]

At the end how is 33626.26+169.2+2.34=23797.8???

[@fuseschool]

It should have been 23626.26, and not 33626.26. Sorry about that!

[@shreepatil4832]

wait.. how is 99.27 x 238 more than 23800?? I got 23626... am i wrong?

[@datboi1861]

No. They just made a little mistake.

[@fuseschool]

You are right, it should have been 23626.26

[@DRSAW43]

Here from school, not really paying much attention anyway just playing fifa

[@sushiios6507]

i got 237.97

[@lovelypawz3958]

can any one tell me if these videos are good for GCSE

[@fuseschool]

Yes they are - they are all based around the GCSE courses.

[@lovelypawz3958]

thanks

[@luckyhashiraa]

@@fuseschool sorry how do you already no the percentage

[@tabassumkhan7966]

when m multiplying the 99.27 ×238 it gives me 23626.26 i did it on calculator tho

[@cargram_008]

ya, maybe its an edit error

[@revinamwasamila1066]

I did not understood abuotn neutrons number.

[@redhandedreaper5176]

99.27 × 238 = 23626.26 on my scientific calculator

[@fuseschool]

Yes, you are right. Thanks for noticing!

[@jereenjeromi7319]

Please explain in Tamil

[@sanuthi2279]

99.26 x 238 = 23626.26 not 33626.26

[@fuseschool]

Yes, you are right! Thanks for noticing!