GCSE Chemistry Revision "Calculating Moles of a Compound"

GCSE workbooks www.amazon.co.uk/Dr-Shaun-Don...
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In this video, we continue looking at the idea of moles. We learn how to use the relative formula mass to calculate the number of moles of a compound. You'll need this later, so it's really important material.
This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.

[@lm2236]

this video makes me wonder if school teachers make it deliberately confusing

[@pastaslut]

literally

[@crow457]

How else are they going to stretch a lesson to 45 minutes?

[@reece_awesome]

@@crow457 45? Mines 75 with 4 lessons

[@kindofcomplex9304]

@@reece_awesomeThought that was just my school

[@AK3Yontop]

@@reece_awesomemines 1 hour and a half with 3 lessons

[@George-cs6wq]

I can never understate how great you are. You seem so much more sympathetic to my struggles than the teachers i have, thank you.

[@matthewmoore5020]

u mean overstate

[@ZKJT364]

ANYONE ELSE BINGING CALCULATIONS? NEED TO KNOW HOW TO DO EVERY CALCULATION BEFORE PAPER 1 ON THURSDAY !

[@querakuraginn4812]

theres not a lot of them, not too hard as welll

[@stardreamix786]

I have paper 1 tomorrow as well haha, hope it went well

[@BillySawAMan]

Bro spoke in past tense and future tense

[@wellwellwell1254]

this cant be what my chemistry teacher was teaching me....I FINALLY UNDERSTAND MOLES. THANK YOU SO MUCH

[@nobukhosinkomo1170]

😂

[@hannah-ho9yd]

thank you! u make this so simple and easy to understand, my teacher made it so confusing

[@emmibee6637]

For the love of all that is holy, THANK YOU. My chemistry teacher explained that formula mass is the same number as molar mass, but didn't explain that it has no unit, nor did he explain the way he got his math. He used a paragraph to explain the "formula" (which he muddied with confusing placeholders), and that was about it.

[@tedcharleton9918]

Thanks Papa

[@pigeonhero3889]

I’m so happy you made these, you’re really helping me get to that level 9 for GCSE.

[@saadarshad9872]

did you?

[@Curryed]

@@saadarshad9872 It will always be a mystery...

[@communist_oranges]

Good luck to everybody taking this exam tomorrow! You've got this, I'm rooting for you!

[@lisa_chogiwa4096]

thank you SO MUCH. i’ve been isolating for the past 2 weeks because of covid which meant i missed out on classes. i have a chemistry test on this in 3 days and i have no idea how to do this. shawn has helped me get good marks on my previous chemistry tests so this man does not disappoint.

[@mrqwerty4792]

One of my personal favourite quotes of his is as follows: ‘if you are doing foundation tier, you may now leave’

[@vinoshafernandes5319]

When ur doing TRIPPLE 😭💀

[@madgt8359]

thanks bro I have a chemistry exam tmrw and this vid just saved ma ass

[@theKYte]

He is the best science teacher on KZbin when you have your exam tomorrow and haven’t started your revision

[@chxrry.blxssms5303]

What?? I was struggling with this so much at school but when I watch this I can understand this in about 3 minutes. Thank you so much

[@lolothisisfunny7627]

could you do a video on practical skills for an exam question as lots of 6 markers have come up in my mocks about reuired praticals

[@connordurkan148]

This guy deserves to be knighted. So much respect for this man who takes his time out to teach so many kids and i am so grateful. Keep up the great work sir!

[@piyudauk2110]

Im taking my GCSE's next year. learning about this right now. Really help. keep it up. Thanks. 👍👍👍👍

[@reconnaissance7372]

I actually didn't think I'd be able to learn this or figure it out but wow.. It's super easy!

[@beanjamin7611]

Thank you so much! This has helped me understand so much more!😁

[@tanfangyi7460]

I don't understand everything my physics teacher say but after watching your vids, i managed to understand that topic

[@Freesciencelessons]

Thanks for the comment. I'm glad to hear that my videos helped you.

[@rajithaaberathne4856]

This is the best mol video I have watched thank you it was very helpfull

[@rachelastor544]

thank you so much, literally in love w u with all youve helped with :)

[@user-tg1zf6ow4o]

Ur videos r a lifesaver

[@molliemccullagh8501]

He.is.the.best.teacher.ever

[@jjangbeoms4346]

Good luck for those sitting paper 1 tomorrow!

[@MarvelAnimations]

Thank you so much for making this video, it really helped me out :D

[@anitamaton5885]

so helpful thank you so much

[@lovelyshaun6166]

Great video.

[@raampillai1913]

U know it’s serious when big man like Shawn gives u a 6 minute video

[@abdulrahmanmohamed2470]

keep the good work

[@bangtanbella6901]

Thank you these videos helped me a lot!

[@babymaya6878]

Could you do a video on electrolysis please? Your vids are so useful.

[@Freesciencelessons]

If you look at this playlist (AQA Chemistry Unit 2 Topic 7 Electrolysis), you'll find three videos on electrolysis. Let me know if you have any questions.

[@babymaya6878]

Thank you!

[@reconnaissance7372]

1 x 24 = 24 , 2 x 35.5 = 71 , 24 + 71 = 95Mr

[@reconnaissance7372]

990g Li2SO4 Li = 7 , S= 32 , O = 16 , Lithium x 2 = 14Mr , Sulpur = 32Mr , Oxygen x 4 = 64Mr , 14+32+64 = 110Mr , 990g Divided by 110 = 9 Moles. Freesciencelessons, thank you so much hehe I always thought this was so much harder to figure out than it is xD

[@Freesciencelessons]

Thanks, I'm glad that you're finding it easier the you expected.

[@a21gos]

Absolute legend

[@user-qg4td6rg5x]

i actually love you

[@accessnft1702]

3 years of chemistry must be learned by Thursday 😢

[@BillyS3459]

Chem on friday 🔥🔥🔥

[@bilalhamad4161]

your the best thank you

[@user-kv5mx6ro5l]

Thanks for the amazing videos, will you be uploading biology and physics 9-1?

[@archiehorsfield1717]

thanks pops

[@Littlemissjayjay7]

Thank you so much Much apprciated

[@_sa_8154]

THANK YOU

[@lissyrose7944]

Thank u againnn

[@unablewalk4147]

thanks

[@sadgemeister3321]

bless your soul

[@-STEM-G-AnonuevoAngelFejjS]

thank you! ^^

[@amna.8870]

THANKYOUU SO MUCH

[@tibbydude3086]

is it best to make notes from these videos and just read them thoroughly

[@Freesciencelessons]

No, personally I'd suggest watching the videos several times until you know the material.

[@adm_ezri]

I find flash cards made from some of the notes shown on screen useful too.

[@emaanahmad4510]

Ben's Pet Duck agreed

[@RSSRSS5]

@@Freesciencelessons views simp

[@crow457]

@@RSSRSS5 Nah, I don't think so. His videos are more concise and easier to digest mentally than notes.

[@ezaanamin8479]

thank you sir very helpful

[@noor-wb5kc]

What's the difference between using Mr and Ar to calculate moles, when do you know which one to use??

[@Freesciencelessons]

Ar is used only for elements (unless they form a molecule eg Cl2). Mr is used for molecules eg Cl2, CH4 etc.

[@noor-wb5kc]

@@Freesciencelessons thankyou!

[@erenyeager6668]

chemistry in 2 hours and im finished 💀

[@ReginaWheeler-np4nn]

how did it go

[@lumiinouss4744]

I've watched u for so long your hairs gone grey xD

[@tobysmith7618]

man how many times have you taken gcse

[@harishankarshikkulal8599]

nice one toby smith

[@aasiyah692]

@@tobysmith7618 😂😂

[@jamesboyer6716]

Science chem mock this week

[@sameernadeem5947]

i've only started revision and the exam is tomorrow I've bummed it

[@noor-wb5kc]

How did it go lmao

[@omneyahashim7475]

Thank you so much

[@Freesciencelessons]

You're welcome and thank you for the comment.

[@pigeonhero3889]

Freesciencelessons you’re a legend mate. I’m saying this for all gcse students. Thank you.

[@aida2369]

what about more advanced questions?

[@Ssoovw]

God sent omds

[@ayahelm.4290]

lek i love u

[@tomcarter7499]

chemistry on friday good luck lads

[@hvsmusic_]

Straight up watching this whilst shitting 1 hour before the exam

[@ryanthomas1882]

Hi Sir, I think you've made a mistake with the Relative Formula Mass (Mr) at 3:19 , I think it is supposed to be 94 not 95. Please do correct me if I'm wrong though. Thank you for all the great videos :D

[@Freesciencelessons]

Hi. Thanks for the comment. The Mr of MgCl2 is 95. You need to remember that the Ar of chlorine is 35.5 not 35. So 24 + (35.5 x 2) = 95. Hope that helps.

[@ryanthomas1882]

@@Freesciencelessons oh yes I did make the mistake XD, i had kept calculating 35.5 x 2 as 70. my bad, thanks again

[@Freesciencelessons]

No problem, it's easy to do so remember to double check calculations in the exam.

[@freddiemcminn2003]

How do you work out moles if you haven't been given a mass

[@itfan42]

Then I don't think it'll be possible 😂

[@claireconner6785]

what if the mole is 0.2 do you have to round it

[@Freesciencelessons]

No that would round down to zero. 1 or 2 decimal places is fine.

[@Jeffkinney467]

Why tf is this guys so underrated

[@sirhenners204]

the god

[@Lego-world]

omg thank you so much i undrstood after this video

[@gurditdosanjh460]

Sir, the last question about beryllium hydroxide is wrong. 9 + 1 =10 + 32 = 42, not 43. Therefore, the relative formula mass (Mr) is 42 not 43. So, the number of moles would be 64.5g / 42 which is 1.5357 rounded to 2dp is 1.54.

[@Freesciencelessons]

No you've made a mistake. Try again and see if you can spot it.

[@gurditdosanjh460]

Oh thanks, sir, I never noticed there are 2 atoms of oxygen. Thank you for correcting me, sir.

[@olijb8330]

@@Freesciencelessons sup

[@jugrajsingh6008]

How much mole are in HCO

[@technicaldickov6199]

can you do an easy way to remember identifying cations and anions

[@Freesciencelessons]

What do you mean? Remember the charges?

[@technicaldickov6199]

aha, not the differences between the two, but for example identifying what a cation or anion is based on its reaction with aqueous sodium hydroxide etc. I do iGCSE Cambridge Chemistry and it is usually one of the later questions in my Paper 6 Alternative to Practical if you need a reference

[@Zimpix]

cheers lad

[@sarahakhtar345]

I dont ses no link above Btw thanks so much for these videos

[@w2blackpanther377]

Press the i button on top

[@sidratulmuntaha5439]

Helping me in gce

[@beanbrother742]

how can my teachers fail to teach me this in the past year but u do it in like a minute? like seriously I know everyone comments this but why are they so bad in comparison I honestly don’t understand 😭😭

[@nathhj6736]

Do we need to learn the moles equation or will it be given to us?????

[@fireemperorzuko8756]

I think you need to learn it

[@bawanhassan413]

year 11 gcses 2020 good luck squad

[@xeenon_6443]

Legend

[@bilalhamad4161]

complete the good work

[@jemimascarlett240]

ayo last minute revision

[@megata6184]

Anyone else got a mock gcse tomorrow

[@h027s]

I'm confused because in lesson we get questions like the ones you showed but with the addition of "in x ml" [x = number], so we have to do what is in the video but then multiple x to get to 1000 ml and do some ratio stuff ? The manipulation of the mls to Ls confuses me but I don't know where I would find questions like that :(

[@h027s]

e.g: "Calculate the concentration of 3.5g calcium sulphate dissolved in 200ml of water in g."

[@h027s]

Nevermind I found the video under "concentration" however I was put off seeing as it said it was a triple science topic even though I don't do triple science. Sorry

[@w2blackpanther377]

@@h027s have you got questions like "What is the number of moles of carbon dioxide molecules in 4g of carbon dioxide?" Or "What is the mass of 0.3 moles of ammonia?"

[@jimohare2665]

2020 mocks gang

[@millysirl3739]

Sometimes I wonder if school actually taught me something completely different because I never understood this until this literal second? Tbh sometimes they give up and play your videos so ...

[@AULipSync]

chemistry paper 1 next thursday...

[@t.stizzy928]

Hypeeeeee

[@keithpemhiwa9033]

I never thought moles could be this easy, dunno what my teacher was saying, maybe cuz i wasnt concentrating XD

[@denmarrrrr]

isn't the Ar of oxygen 8 not 16 ?

[@saleenaross9936]

This made way more sense

[@Ryan.g05]

Anyone here today for year 11 controlled assessments?

[@weeklydoseofcomedy674]

why didn't the teachers teach me this

[@yossefelbeshbishy3018]

💋

[@juliasanchezgarcia6052]

It’s late tomorrow is my chemistry gcse paper in the morning and I know nothing. I’m freaking outttttt.

[@Mimi-fh5ve]

maaaaaas

[@95mustafa]

[@znarwhal4530]

i liek molez

[@mr.electro4674]

150:1 like: dislike