What is the mole concept?

Question

I think its mass divided by atomic mass units...what is that?

Answer 1

the way to determine number of moles is mass divided by molar mass, the way that you determine the molar mass is to add the individual atomic masses of the atoms within the molecule eg. H2O you have 2H that each weigh 1.008g/mol and one O that weighs 16 g/mol the molecular weight would be 18.016g/mol. A mole is the mass of a specific number of atoms, it is avagdros number of atoms(a constant), you probably don't need that though

Answer 2

A mole is 6.022 × 10^23 molecules of a given substance. So if you have 1 mol of iron, you have 6.022 × 10^23 atoms of iron. If you have a compound, like H2SO4, 1 mol would be 6.022 × 10^23 molecules of H2SO4. Think of a mole like a dozen. A set number of "things" that can be described as a set.

Molar Mass (g/mol) is the mass of a single mole of the substance. Molar mass is found by adding the atomic mass of each atom in the molecule. For example, CH3 would have a molar mass of 12.01 + 1.01 + 1.01 + 1.01

The equation for moles is:

n=m/M

where n=moles, m=mass, and M=molar mass

Answer 3

It's very simple: A mole of something is 6.02 x 10^23. A mole of atoms is 6.02 x 10^23 atoms. for that matter, a mole of bricks is 6.02 x 10^23 bricks. The atomic mass unit is the mass in grams, of 1 mole of atoms. For example, Carbon has atomic mass number 12.
Therefore, 1 mole of carbon atoms (6.02 x 10^23 of them) weighs 12 g.

Answer 4

The mole (symbol: mol) is the SI base unit that measures an amount of substance. One mole contains Avogadro's number entities
The entities that you want to count could be atoms, molecules, electrons, photons, etc.

The number of atoms in 12g of carbon-12 is known as Avogadro constant, and is determined empirically.
From this convention, you can calculate every molecular weight of any other atom(with the correction for isotopic distribution) or molecule(just sum the MW of the atoms in it)

So you need nearly 16g of oxygen atoms to make a mole (because the mw is nearly 16)
and you just need 1g of hydrogen atoms to make a mole of hydrogen (because the mw is nearly 1)

But what is the point of doing this calculations ?
Simple: because molecules and atoms react always in molar ratios !
Check this example:
2H2 + O2 --> 2H2O
so 2 moles of hydrogen react with 1 mole of oxygen to give 2 moles of water.

Number of particles is a more useful unit in chemistry than mass or weight, because reactions take place between atoms (for example, two hydrogen atoms and one oxygen atom make one molecule of water) that have very different weights (one oxygen atom weighs almost 16 times as much as a hydrogen atom). However, the raw numbers of atoms in a reaction are not convenient, because they are very large

Answer 5

The mole concept is similar to the following example.
A dozen eggs = 12 eggs
so, 1 mole = 6.02*10^23 atoms, particles, ions or so on.
so, 2 moles = 2 * (6.02*10^23)
Chemistry uses moles to count atoms, particles, or ions, as we cannot calculate easily the huge number of these things in daily life. instead of each time using the 6.02*10^23 number we just represent it by 1 as in 1 mole. so that we can easily calculate things such as mass, molar mass, volume of gas, etc.
no.of moles = mass/molar mass
no.of moles = no.of particles/6.02*10^23
e.g
2HCl + Zn --> ZnCl2 + H2
in this equation,
there are 2 moles of HCl and 1 mole of Zn used.
so there are 2 * 6.02*10^23 HCl molecules in the solution and
1 * 6.02*10^23 Zn atoms in the Zn metal used for the reaction.

I hope u can understand what is the mole concept now.

Answer 6

The mole is a number fixed of molecules equal to Avogadro's number

N = 6.023 10^23

the molecular weight is the mass of this number of molecules.

Usually in a problem you calculate the molecular weight which is the sum of the atomic weights of the atoms in the molecule.

If you want the mass of ONE molecule , you divide the molecular weight by Avogadro's number

Answer 7

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Answer 8

if you divide the given mass(g) by its molecular weight u ll get the mole of that molecule.

Answer 9

a mole in hand is worth 2 in the bush.