Chemistry & Moles

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Atomic Mass, Moles & Calculations

Mass Numbers: Number of protons & neutrons added together in an atom (the number at the top in the symbol)

  • Oxygen = 16 (8 protons, 8 neutrons)
  • Carbon = 12 (6 protons, 6 neutrons)
  • Sodium = 23 (11 protons, 12 neutrons) (23-11)

Number of Neutrons = mass number - atomic number

AN isotope is when an atom has a different number of neutrons in the atom (same number of protons)
 - Carbon 14/Carbon 12

 AN isotope may have a different mass or be radioactive as a result of having more neutrons.

Hydrogen has no neutrons.
It does however has three isotopes;
Hydrogen
Deuterium
Tritium  
All three have different masses. Tritium is radioactive and also the heaviest as it has the largest mass number and more neutrons and protons.

 BTW - NEUTRONS & PROTONS HAVE THE SAME MASS. 

 

MOLES

What the Hell is a mole? 
  A mole was however many carbon atoms would fill a bucket. (6.02 x 10 the 23)

We can apply this to other atoms. We just use the other element's atoms, eg oxygen, to fill that same bucket and see how many carbon buckets or 'moles' we'll have to fill.

RAM = relative atomic mass 
The number…

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