1.2/S1.4.1 Determine the number of particles/amount of substance (in moles) [SL IB Chemistry]

Number of particles = moles x 6.022x10^23

How many eggs in half a dozen eggs ?
An egg has a mass of 50g, what is the mass of 2 dozen eggs?
How many dozen is 18 eggs?

If you can answer these questions, you can do those based on moles. The maths is exactly the same, just using bigger numbers!

[halftimelordwizard]

your voice is really soothing
chemistry still sucks tho

[ibchemvids]

12 x 10^23 = 1.2x10^24
both are the same, this is similar to

12x10^2 = 1.2x10^3=1200

the first number (1.2) needs to be between 1 and to be in scientific notation = standard form

[ibchemvids]

1 mole of CO2 = 12+16+16 = 44g
So 88g is 2 moles of CO2
Since 1 mole = 6x10^23 (1dozen = 12, 1pair = 2 etc)
I have 2 moles of CO2 = 12x10^23 CO2 molecules
12x10^23 carbon atoms
12x10^23 TIMES 2 O atoms (doubled since there are twice as many O as there are C)

[jjaytimestwo]

For the CaF2, you wrote "40+19+19" <i'm guessing that's the Ca (g) and the F(g), but could you explain it a bit more?? Wouldn't that affect calculations in iii??

And also when you doubled the final number, when you doubled it, you wrote 1.2 x 10^24, is it supposed to be like that, or was that a mistake? wouldn't the the 10 still be to the power of 23 ??

P.S your videos are amazing <3

[ranazahr]

Hi, are you still there to ask a question?
Need to determine number of particles of a material, such as sugar, per 10grams.
How to calculate?

[maggester]

this is so incredibly helpful, thank you!

[ibchemvids]

12g of carbon contains 6x20^23 atoms of carbon

each of these 6x10^23 atoms as 6 electrons so in total there are
6 x 6x10^23 electrons in 12g of carbon

[NoufAbdulla]

I dont get the how many electrons in 12g of C

[ibrahimsalloum]

But if you have 88 gr of CO2 and you are suppose to find the nb. of C atoms and O2 atoms, how do you do?

[fanChelsea]

sorry I don;t understand, if in 1mol CO2= 6.02*10^23atoms of CO2

I just don't see how there is 6.02*10^23atoms of C
and 6.02*10^23atoms *2 of O2,

like 6.02*10^23 =1 mole how does that have anything to do with the number of atoms?

thanks

[rachapallysreedevi]

is there any introduction for this concept ?

[ibchemvids]

Imagine 1 dozen CO2 molecules.
This contains:
12 C atoms and 24 O atoms (not O2 as you said in the question)

[fozzyprozzy]

I don’t understand how 6*10^23=CO2=1 mole but C by itself is equal to 6*10^23

[mimis]

You made a mistake is 1.35 not 13.5. I think this videos are awsome thank you

[nourhaydar]

1 electron is 1 mole..? how does this work

[mariesimkova]

i don't get the last one, i don't get how you got 4*10^-22 :/// and we have a test on monday :// no one's commented for a year dang it.

[chicka]

I don't understand why the 23 changed to a 24 :/

[jjaytimestwo]

Oh, actually ignore the 10^24 question I see it now, haha woops I'm bad at maths.