Question
Fri March 09, 2012 By:
 

Define mole?How many grams of sodium will have the same number of a atoms as 6 grams of magnesium?(given Na=23u,Mg=24u)

Expert Reply
Sat March 10, 2012
Mole is a measuring unit of chemistry. 1 mole contains the same number of particles as there are in 12g of carbon-12 atoms by definition. 
This number is called the Avogadro number or Avogadro constant (NA or L) and is equal to 6.022 x 1023 particles.
 
 

No. of atoms in Mg2 = (6 / 24) * 6.022 * 1023.

= 1.5055 * 1023.

No. of grams in Na = (1.5055 * 1023 *23) / (6.022 * 1023)

= 23 / 4

= 5.75 grams.


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