Thursday, 7 February 2013

How do you calculate the number of particles in 1.00 mole of nitrogen atoms?


How do you calculate the number of particles in 1.00 mole of nitrogen atoms?



Atomic/Molecular Weight of a substance = 1 Mole of that substance 
1 Mole of any substance = (6.022 x 10^23) particles
 
so,
 
For Nitrogen,
 
Atomic Weight of Nitrogen = 14 gm = 1 mole of Nitrogen
 
(whatever may be the atomic/molecular weight of a substance, 1 mole of that substance is always equal to the atomic/molecular weight of 1 atom/molecule of that substance.)
 
so,
 
no. of particles in 1 mole of nitrogen (or 14gm of nitrogen) is equal to (6.022 x 10^23).
 

Can someone please help me with this question its very very important. If 27.0 g of Fe reacted with an excess of O2, how many moles of Fe2O3 are formed? 
4Fe+ 3O2-->2FeO3

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