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Counting Atoms

Counting Atoms. 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.

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Counting Atoms

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  1. Counting Atoms 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 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.

  5. 2H2O How many hydrogen atoms are present? How many oxygen atoms are present?

  6. 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

  7. 4CaCO3

  8. 3CO2

  9. 2C6H12O6

  10. 6K2SO4

  11. CaMg(CO3)2

  12. 3Pb(NO3)2

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