Please help me get 10 point?mole example

Question

please discribe mole and molarity with good example

best answer :10point

Answer 1

When we say "mole" or "mol" in chemistry we usually mean gram mole. A molar mass is the weight in grams of one mole and is the mass in grams of 6.022 x 1023 entities. The molar mass of a substance is the molecular weight in grams. See the reference below for more detail.

Molarity is the number of moles of solute dissolved in one liter of solution. The units, therefore are moles per liter, specifically it's moles of solute per liter of solution.  

molarity = moles of solute divided by liters of solution

Rather than writing out moles per liter, these units are abbreviated as M or M. We use a capital M with a line under it or a capital M written in italics. So when you see M or M it stands for molarity, and it means moles per liter (not just moles).

It is important to distinguish between moles and molarity. "Moles" measures the amount or quantity of material you have; "molarity" measures the concentration of that material. So when you're given a problem or some information that says the concentration of the solution is 0.1 M that means that it has 0.1 mole for every liter of solution; it does not mean that it is 0.1 moles.

OK?

  

Answer 2

Moles are an unit for the number of atoms/molecules/ions or in general particles, like a dozen eggs, or a pair of socks. A mole contains 6.0224 * 10^-23 atoms. This is called the Avogadro's constant, and this is standard always.

Now some common misconceptions,

lets say we have 1 mole of H2O. But you should remember, this 1 mole of H2O contains 2 moles of H particles, because when you break the thing up, you have 2 'units'of H.

Another thing- 1 mole of a substance weighs the (x) grams where x is the molecular mass on the periodic table.

Molarity is the number of moles in a solution, or the concentration. Like if you say something is 1M or 1 mol/dm^-3 in concentration, it is actually that there is 1 mole of the substance in 1 dm^3 or 1L or 1000cm^3 or 1000mL.

Therefore, molarity= mole/volume

Answer 3

Molarity is just another way of expressing concentration. Molarity is the number of moles of solute dissolved in one liter of solution. The units, therefore are moles per liter, specifically it's moles of solute per liter of solution.

You must be very careful to distinguish between moles and molarity. "Moles" measures the amount or quantity of material you have; "molarity" measures the concentration of that material. So when you're given a problem or some information that says the concentration of the solution is 0.1 M that means that it has 0.1 mole for every liter of solution; it does not mean that it is 0.1 moles. Please be sure to make that distinction.

0.1 M of HCL is less concentrated than 0.2 M of HCL

Answer 4

The best way to think of a mole, is to think of eggs.  A dozen eggs, a mole of atoms.  A dozen eggs is 12 eggs.  A mole of atoms is 6.02E23 atoms.  Well, atoms are much smaller than eggs, so it just takes a bigger number of them to be useful.  That's why a strange-sounding one like the 'mole' had to be invented.  'Mole' is just short for 'gram-molecular-weight', and the number is simply the number of atoms there are in a collection that weighs a number of grams that is equal to the molecular weight.  If something has a molecular weight of 45, this definition means that one mole of it weighs 45 grams.   Sort of like expressing the weight of a dozen eggs - chicken eggs, duck eggs, goose eggs, robin eggs.  They're all eggs, they could all come in a dozen, but they weigh different amounts.  

Molarity is just the number of moles of a substance that is present in a liter of solution.  It's the concentration of the thing in the solution.  So if you have a 2M solution, and have 1/4 of a liter of it, then there is 1/2 mole of solute in it.

Answer 5

Moles and molarity are two scientific terms. Mole is a unit just like a dozen, where as a dozen represents 12, a mole represents 6.02(23-indices), this huge number is used to count things like atoms, ions and molecules. Fact: A mole of atoms of any element has a mass equal to its atomic mass in grams. If you weigh one mole of particles, and add water to make a liter of solution, the solution would have a molarity of one. If you want a smaller solution, you would add a smaller amount of salt,