Relative Atomic Mass | Properties of Matter | Chemistry | FuseSchool

Learn the basics about Relative Atomic Mass. It is a tricky concept that's actually quite simple to understand and here, you will know how to calculate it. Find more in this video!

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This video is part of 'Chemistry for All' - a Chemistry Education project by our Charity Fuse Foundation - the organisation behind The Fuse School. These videos can be used in a flipped classroom model or as a revision aid. Find our other Chemistry videos here:

[eikaykhinekyaw]

I love how that put notes to remember at the end. It's super helpful.

[patrickmerkel]

This is supposed to be the updated video (they published an older video on the same topic), but the only difference I see is the addition of an intro in the beginning. Not very much of an updated video in my opinion. This video still has the same problem as the last one: it never explains the relation of atomic mass to the atom carbon-12. This left me more confused after the video than before. Here is the answer: The mass of the element carbon can be measured very accurately (more accurately than any other easily-obtained element), and so was set as the standard for atomic mass with a mass of 12. The particular isotope carbon-12 was chosen because it is the most abundant isotope and 12 is also a very nice number to work with. Therefore, one atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12 atom. Protons and neutrons each have a mass of 1 amu. Electrons are so small they are said to be weightless. So yes, atomic mass is based on the carbon-12 atom, but atomic mass is almost always referred to in amu. It would be pointless to say the atomic mass of chlorine is 35.5 times 1/12 the weight of a carbon-12 atom. You would just say it is 35.5 amu. The fact that the 35.5 is related to carbon-12 is implied. Hope this helps!

[AbdullahiMohamud-orfr]

Thanks for your clear explanation. You deserve a big thumb. Well done and keep it up.

[lecapitalist]

firstly,
how do you find the abundance%
and thank you for explaining in a simple slow way

[haz]

Good video! Straight to point, I just wanted to see the calculation which you explained very nicely!

[sushantsinghrajputkavascg]

Really the best explanation if you watch the full vedio i enjoyed as well

[maryammaryam]

thank you exactly what i needed to know

[mirajmiraj]

Thats amazing because of u i have got 74 out of 75 in my mid term exam

[sumaiyatasnim]

You always know how to make complex stuffs simplified.

[malaikamalaika]

Thanks for the video it helped me alot!

[shiromalfernando]

How do you find the abundance%?

Pls tell me, I need it for next weeks exam.

[colletteikeanyibe]

What's the difference between mass number and relative atomic mass

[aliyahkhan]

what if it was a different element i.e: not chlorine how would we be expected to know how much of a percentage of an atom lets say zinc was? or would we be given the percentage?

[m-pretzel]

so does 1 atom of chlorine have a mass of 35.5 grams?

[kenzimohamed]

How did u get the number of atom present ?!
Please I need the answer I’m IGCSE student

[milkyrox]

Thanks this video helped me a lot! I just wanted to ask that is the relative atomic mass and the relative mass the same?

[aliusman]

Why the fuck do they compare this simple shit with carbon-12?

[toolng]

so at school it was 20 minutes of not understanding
and here in 3 min I got it lol

[ifrah]

If u can speak a little slower it would help and can u kindly explain it better. It didn't even help. This wont help beginner"s like me.

[nopenotatall]

You had a really boring voice and I'm sorry I kind of know that's a little basic but I couldn't concentrate. The video was well informing though, and it helped.