Chemistry Mole Number

  

Because the mole contains so many units, they’re most often used in chemistry is a way of measuring really really small things like atoms or molecules. So a mole of water is 6.02 x 10 23 molecules of water, which works out to be about 18 grams, or 18 mL. 1 mole of any substance contains 6.022 × 10 23 particles. 6.022 × 10 23 is known as the Avogadro Number or Avogadro Constant and is given the symbol N A(1) N = n × N A N = number of particles in the substance. Students know one mole equals 6.02 x 1023 particles (atoms or molecules). Students know how to determine the molar mass of a molecule from its chemical formula and a table of atomic masses and how to convert the mass of a molecular substance to moles, number of particles, or volume of gas at standard temperature and pressure. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing! Because this is a very big number, scientists shorten it to 6.02 x 10 23. Professor Molenium also told us this number is named after the scientist, Amedeo Avogadro, and it’s called Avogadro’s number –.

The Mole Concept with Examples

Atomic Mass Unit with Examples

Since atoms are too small particles we can not measure their weights with normal methods. Thus, scientist find another way to measure mass of atoms, molecules and compounds. They approve one atom of carbon isotopes 6C12 as 12 atomic mass unit. Mass of every elements expressed in terms of atomic mass unit is called relative atomic mass. We can also calculate relative molecule mass with same method; adding individual atomic masses of elements gives us relative molecular mass. For example;

1 H atom is 1 amu (amu=atomic mass unit)

1 Ca atom is 40 amu

1 Mg atom is 24 amu

1 H2O molecule includes 2 hydrogen atoms and one oxygen atom;

(2.1)+(16)=18 amu

Example: Which one of the following molecules has greatest relative molecular mass.

I. CO

II.SO2

III. Fe2(SO4)3

IV. CaCO

Solution:

I. One CO molecule includes one C atom and one O atom

Molecular mass of CO=(1.12)+(1.16)=28 amu

II. One mole SO2 includes one S atom and two O atoms.

Molecular mass of SO2=(1.32)+(2.16)=64 amu

III. One mole Fe2(SO4)3 includes 2 Fe atoms 3 S atoms and 12 O atoms.

Molecular mass of Fe2(SO4)3=(2.56)+(3.32)+(12.16)=400 amu

IV. One mole CaCO3 molecule includes one Ca atom, one C atom and 3 O atoms.

Molecular mass of CaCO3=(1.40)+(1.12)+(3.16)=100 amu

Thus; Fe2(SO4)3 has greater molecular mass

Including C, most of the elements have isotopes. We must consider atomic masses of all isotopes while writing it in periodic table. Example given below shows how to calculate average atomic mass of elements having isotopes.

MassX=M(X1).%X1/100+M(X2).%X1/100+..

where; MassX is the average mass of X element

M(X1) and M(X2) are masses of isotopes

%X1 and %X2 are Percentages of atomic masses of X element in nature.

Example: Relative atomic mass of one element is 44,1 amu and it has two isotopes.If one of the isotopes has atomic mass 42 amu and percentage of it is 30%, find the atomic mass of second isotope.

Solution:

If one of the isotopes has 30% of atomic mass, other isotope has 70% of atomic mass.

Chemistry Mole Number Of Bonds

MassX=M(X1).%X1/100+M(X2).%X1/100+..

44,1=42.30/100+M(X2).70/100

M(X2)=45 amu

The Mole Concept and Avogadro's Number

A concept used for measure amount of particles like atoms, molecules. Number of atoms in the 6C12 element is equal to 1 mole. Number of particles in 1 mole is called Avogadro's number; 6,02.1023.

1 mole atom contains 6,02x1023 atoms

1 mole molecule contains 6,02x1023 molecules

1 mole ion contains 6,02x1023 ions

Mole=Number of Particles/Avogadro's Number

Example: Which ones of the following statements are true for 2 moles CO2 compound.

I. Contains 1,204x1023 CO2 molecules

II. Contains 2 mole C atom

III. Contains 3,612x1024 atom

(Avogadro's Number=6,02x1023)

Solution:

I. 1 mole CO2 contains 6,02x1023 CO2 molecules

2 mole CO2 X CO2 molecules

__________________________________________

X=1,204x1023 CO2 molecules

Mole

I is true

II. 1 mole CO2 contains 1 mole C atom

2 mole CO2 contains Y mole C atom

_______________________________________

Y=2 mole C atoms

II is true

III. 1 mole CO2 contains 3.6,02x1023 atom

2 mole CO2 contains Z atom

______________________________________

Z=3,612x1024 atoms

III is also true

Example: Find the mole of molecule including 1,204x1023 NH3.

Solution:

1 mole NH3 contains 6,02x1023 molecule

X mole NH3 contains 1,204x1023 molecule

___________________________________________

x=0,2 mole NH3 molecule

We can solve this problem using formula given above;

Mole=Number of Particles/Avogadro's Number

Mole=1,204x1023/ 6,02x1023=0,2 mole

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There are about 20 species of fuzzy moles (the kind that crawl around on the ground), and one kind of mole that might appear on your face, but today is a day for celebrating a different kind of mole. Today’s mole is a unit — one invented by a man named Avogadro.

Really, a mole is just a group of objects. You can think of “a mole” the same way you think of “a dozen.” You’re probably familiar with a dozen eggs, or chickens or planets. Moles are no different. You can have a mole of molecules or people or cheeseburgers. But there are a lot more than twelve things in a mole — there are 6.02 x 1023. That’s 602,000,000,000,000,000,000,000 things. Because the mole contains so many units, they’re most often used in chemistry is a way of measuring really really small things like atoms or molecules.

So a mole of water is 6.02 x 1023 molecules of water, which works out to be about 18 grams, or 18 mL. A mole of aluminum is about 26 grams. But to really appreciate how many molecules are in a mole it helps to think about things we can see. To do that, let’s try these comparisons from Daniel Dulek’s lesson about how big a mole is.

Chemistry Mole And Avogadro's Number

A way to think about the relative size of a mole?

If you had a mole of doughnuts, they would cover the entire Earth in a doughnut-layer five miles deep.

Chemistry Mole Number Of Water

If you had a mole of basketballs, you could create a new planet the size of the Earth!

Chemistry Mole Number Of Molecules

If you received a mole of pennies on the day you were born, and spent a million dollars a second until you died at 100, you’d still have over 99.99% of your money in the bank.

Mole Chemistry Definition Number

One mole of red blood cells is more red blood cells than exist in every human on earth right now. A mole of cereal boxes stacked end to end would reach from the Sun to Pluto 7.5 million times. A mole of turkeys could form sixteen earths.

Okay, so now that we know why a mole has 6.02 x 1023 things in it, what can we do with that information? Moles in chemistry are far more useful than moles in the ground, or on your face. They factor into all kinds of equations and important concepts in chemistry. Chemists think of moles or atoms like you and I think of a dozen eggs – we add them to recipes, order them from the store and calculate what we need based on how many we have.

Mole Number

What would a mole of fuzzy moles look like? Well, the pile of animals would weigh a little over half of the mass of our moon. Thankfully, there’s no chemistry equation in the world that calls for that many mammals. But if there was, you’d now know just how many mammals that would be.