aslaam alykum,

The mole is a large number, aprox 600 000 000 000 000 000 000 000

that = 1g of hydrogen
=12g of carbon
24g of magnesium

Therefore the relative atomic mass of an element can be expressed in grams contains ONE mole of atoms. This means that the number of atoms of an element can be worked out by weighing.

Calculations can be done by simple equations,

Moles of atoms = mass/RAM

Examples:
1) how many moles of atoms are there in 72g of Mg?
(RAM of mg= 24)

Write down the formula Moles= mass/RAM
rearang if necessary (not needed)
Subsitute the numbers moles= 72g/24
Write the answer and units moles = 3moles

2) what is the mass of 0.1 moles of carbon atoms?
(RAM of carbon = 12)
Write formula
rearange mass= moles * RAM
sub numbers mass= 0.1 * 12

3) how to work out chemical formulae:
What is the simplest formula of a hydrocarbon that contains 60g of carbons combined with 20g of hydrogen?
(RAMS = H=1 C= 12)
Write mass of each element C= 60 H = 20
work out moles using formula
find simplest ratio (divide by smallest number) 5/5= 120/5=1
Write the formula showing the ratio of atoms CH4 (LOL)

4) Moles of molecule
just add all the RAM masses together
e.g water = H2O (H=1, O= 16
The Relative Molecular Mass (RMM) = 1+1+16= 18

or

Carbon dioxide, CO2 (C=12, O=16)

The RMM = 12+16+16=44

('2' only applies to the oxgyen atom, coz theres 2 of them)

hope that helps, or has it just made u more confused??

wa alykum aslaam

jazakallah khair brother!
im slowly understanding it alhamdulilah. i'll read it a couple more times to get the hang of it.

aslaam alykum,

if you want i can try and make it less complicated....... or if ur happy with it.....

wa alykum aslaam

Mashaalah guys keep it up, no pain no gain,

anyone giving maths, english, accounts , economics , busines studies or urdu?

aslaam alykum,

ok a maths question for u.......

factorise the following:

1) y2-a2 (y squared - a squared)
2) x3 - x (x cubed)
3) a3- ab2

there will be more later........

wa alykum aslaam

erm ok, i dont know if this is write but here it goes,

bismillah hirahman niraheem

1) y2-a2 (y squared - a squared)
2) x3 - x (x cubed)
3) a3- ab2

1)yxy -axa =(y2-a2)???
2)XxXxX-XxXxXxX= X2(X-X2)
3)axaxa-axbxaxb=a2(a-b2)

2 = squared im guessing you ment the same thing right?

aslaam alykum,

1) soz wrong, try again, its completing the square
2)soz wrong again,
3)nope

its completing the square, try again, dont give up.........

wa alykum aslaam

wot! lolz!

wot do you mean completing the square?

the dierence of two sqaures:

x2-y2= (x-y) (x+y)
REMEMBER THIS RESULT!

e.g:
y2-16

y2-16 = (y-4)(y+4)

you see how i got that?

I'm not that high yet.

lolz me neither! i c how you got that
x2-y2
so for example then *just to practise* if y2=48 then the answer would be (y-7)(y+7) is that right?

what about if x2=100 would i do the same thing as above?

mr.baldy, r u in set 1?

ooh you guys are too advanced for me lol

aslaam alykum,

yeah sister hijabi sista u got it,

no im not in set 1, im not that good at maths..........

anyways ok, ermmmm any of u guys doing Merchant of Venice?

wa alykum aslaam