How to count atoms.

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COUNTING ATOMS.

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Presentation transcript:

How to count atoms

2H2O COEFFICIENT SUBSCRIPT

2H2O The coefficient gets applied to the ENTIRE formula -this means that there are 2 molecules of water present! -you MULTIPLY this number by every subscript in the formula

2H2O 2 MOLECULES!!!!

2H2O The subscript only gets applied to the element it follows -In the case of a Water Molecule (H2O) there are 2 Hydrogen atoms in the molecule - If there is no subscript present, it is assumed that there is only 1 atom of that element in the molecule

2H2O How many hydrogen atoms are present? 2 (coefficient) x 2 (subscript) = 4 How many oxygen atoms are present? 2 (coefficient only) = 2

The easiest way to count atoms: 1. Write down all of the symbols for all of the elements present in the formula 2. If there is a coefficient, write this number next to each of the symbols 3. Multiply the coefficient by the subscripts of each of the elements present in the formula

Let’s try an example: 4CaCO3

1. Write down symbols 4CaCO3 Ca C O

2. Write down the coefficient next to each symbol 4CaCO3 Ca C O 4

3. Multiply by the subscript 4CaCO3 Ca C O 4 X 1 3

Multiply… 4CaCO3 Ca C O 4 X 1 3 = 4 12

Add totals together to get the total amount of atoms 4CaCO3 Ca C O 4 X 1 3 = 4 12 20 atoms

3CO2

3CO2

2C6H12O6 GLUCOSE

2C6H12O6

6K2SO4

6K2SO4

CaMg(CO3)2

CaMg(CO3)2