Islamic Forum # Chemistry....lol.

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:D

Ok, this is just from the top of my head because i forgot how to do it,

say like you have an element

say Copper for example, if i want to find out how many grams are in 1 mole of copper, how do i go about doing that?

(sorry i know im a n00b at chemistry)

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:D

Simple equation: No. of moles = Mass (g) X Mr/Ar

so if you rearrange the equation:

Mass (g) Cu= No. of moles/ Ar

= 1/ 63.5

= 0.016 g

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:D brother ahm. My chem is a bit rusty (finished few years back) but from what i member:

The golden Eqn is:

MOLES = MASS / Mr

Here, Mr = MOLECULAR WEIGHT .

The Molecular weight is how much One Mole of a particular element/compond would weigh. So, one mole of Copper would weigh 63.5 grams; 1 mole of Iron would weigh 56 grams etc.

We use moles cos this allows us to make comparisons - in other words, the number of atoms in 1 mole of Cu is exactly the same as the number of atoms in 1 mole of Fe (i.e number of atoms 63.5 grams of Cu = number of atoms in 56 grams of Fe)

(this is what i can recall from top of my head...if anyone finds any errors plz correct!!)

Wassalam

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:D

Yeah the above is correct, but if you just want to know the weight of one mole it will be the atomic weight of that element listed on the periodic table. no need to calculate.

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:D

Ok, this is just from the top of my head because i forgot how to do it,

say like you have an element

say Copper for example, if i want to find out how many grams are in 1 mole of copper, how do i go about doing that?

(sorry i know im a n00b at chemistry)

:D

mole (n) = mass of cupper/ molar mass of copper

n= m/Mr

=1/63

=0.0159mol

inshaAllah i hope this help

:D

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:D

Yeah the above is correct, but if you just want to know the weight of one mole it will be the atomic weight of that element listed on the periodic table. no need to calculate.

:D

true because in that instance you know the mole and the molecular mass already, so now just need the mass ( unknown)

n= m/Mr

Let's take Sodium (Na) for example n=2mol, m=?, Mr=23g/mol

m(Na)=n(Na) x Mr(Na)

=2 x 23

=63g

:D

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:D ermm....excuse me for interrupting...but, wouldn't 2*23=46 :D

:D

Opppps sorry a typo.

yes bro you are right. very obviouse. :D

:D

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