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First, write the equation.

First, write the equation. Count the number of atoms on each side of the equation. 1. =. 1. K - _____ H - _____ N - _____ O - _____. K - _____ H - _____ N - _____ O - _____. 1. 2. 1. 1. =. 3. =. 3. Count the number of atoms on each side of the equation. 2. 2x3=6. 1. =.

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First, write the equation.

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  1. First, write the equation.

  2. Count the number of atoms on each side of the equation. 1 = 1 K - _____ H - _____ N - _____ O - _____ K - _____ H - _____ N - _____ O - _____ 1 2 1 1 = 3 = 3

  3. Count the number of atoms on each side of the equation. 2 2x3=6 1 = 1 K - _____ H - _____ N - _____ O - _____ K - _____ H - _____ N - _____ O - _____ 1 2 2 1 2 1 = 6 3 = 3

  4. Count the number of atoms on each side of the equation. 2 2 2x3=6 1 = 1 2 K - _____ H - _____ N - _____ O - _____ K - _____ H - _____ N - _____ O - _____ 1 2 2 = 1 2 1 2 6 3 3 6

  5. Count the number of atoms on each side of the equation. 2 2 1 = 1 2 K - _____ H - _____ N - _____ O - _____ K - _____ H - _____ N - _____ O - _____ 1 2 2 = 1 2 1 2 6 3 3 6

  6. Count the number of atoms on each side of the equation. 2 2 1 1 2 K - _____ H - _____ N - _____ O - _____ K - _____ H - _____ N - _____ O - _____ 1 2 2 = 1 2 1 2 = 6 3 3 6 =

  7. Count the number of atoms on each side of the equation. 2 2 2 2 1 1 2 K - _____ H - _____ N - _____ O - _____ K - _____ H - _____ N - _____ O - _____ 1 2 2 = 1 2 1 2 = 6 3 3 6 =

  8. Count the number of atoms on each side of the equation. 2 2 2 2 1 1 2 K - _____ H - _____ N - _____ O - _____ = K - _____ H - _____ N - _____ O - _____ 1 2 2 = 1 2 1 2 = 6 3 3 6 =

  9. To find the mass of the reactants: • Find each element on the Periodic Chart • Find the Atomic Mass for each element • Add the atomic mass for each atom to get the total mass for the reactants

  10. 78 K (potassium) has an atomic mass of 39. There are 2 K (potassium) atoms. 2x39= 78

  11. 78 2 H (hydrogen) has an atomic mass of 1. There are 2 H (hydrogen) atoms. 2x1=2

  12. 78 2 +28 N (nitrogen) has an atomic mass of 14. There are 2 N (nitrogen) atoms. 2x14=28

  13. 78 2 +28 +96 2+28+96=126 O (oxygen) has an atomic mass of 16. There are 6 O (oxygen) atoms. 6x16=96

  14. 78 126 78+126=204

  15. 204

  16. 78 K (potassium) has an atomic mass of 39. There are 2 K (potassium) atoms. 2x39= 78 2x39= 78

  17. 78 +28 N (nitrogen) has an atomic mass of 14. There are 2 N (nitrogen) atoms. 2x14= 28

  18. 78 +28 +96 78+28+96=202 O (oxygen) has an atomic mass of 16. There are 6 O (oxygen) atoms. 6x16=96

  19. 202 2 202+2=204 H (hydrogen) has an atomic mass of 1. There are 2 H (hydrogen) atoms. 2x1=2

  20. 204 204 YES

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