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COUNT ATOM

COUNT ATOM. How to count atoms. 2H 2 O. COEFFICIENT. SUBSCRIPT. 2H 2 O. 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. 2H 2 O. 2MOLECULES!!!!. 2H 2 O.

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COUNT ATOM

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  1. COUNT ATOM How to count atoms

  2. 2H2O COEFFICIENT SUBSCRIPT

  3. 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

  4. 2H2O 2MOLECULES!!!!

  5. 2H2O The subscript only gets applied to the element it follows -If there is no subscript present, it is assumed that there is only 1atom of that element in the molecule.

  6. 2H2O How many hydrogen atoms are present? 4 How many oxygen atoms are present? 2

  7. 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

  8. Let’s try an example: 4CaCO3

  9. 4CaCO3

  10. 1. Write down symbols 4CaCO3 Ca C O

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

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

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

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

  15. 3CO2

  16. 3CO2

  17. 2C6H12O6 GLUCOSE

  18. 2C6H12O6

  19. 6K2SO4

  20. 6K2SO4

  21. CaMg(CO3)2

  22. CaMg(CO3)2

  23. 3Pb(NO3)2

  24. 3Pb(NO3)2

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