Question
Sun February 12, 2012 By: Sumeet Sokhey
Arrange the following in increasing order of mass in grams:-
 
1. One atom of silver
 
2. Two gram atoms of nitrogen.
 
3. One mole of calcium

Numerical

Expert Reply
Mon February 13, 2012
1. Mass of 1 Ag atom:
 
As we know 1 mole or 6.023 x 1023 atoms of Ag has mass = 107.8682 g
So, mass of 1 Ag atom =  107.8682 / 6.023 x 1023 = 1.792 x 10-22 g
 
 
2. Two gram atoms of nitrogen.(gram atom = One mole of atoms of an element.)
 
1 mole of N2 is 28g/mole
1 molecule of N2 is 28 AMU (atomic mass units).
1 atom of N (1/2 of the diatomic molecule N2) is 14 amu.
 
So, mass of 2 g atom of nitrogen = 28 g
 
 
 
3. 1 mole of Ca
 
1 mole of Ca has mass = 40.08 g
 
 
4. 2 g Sodium
 
 

So, the arrangement will be One mole of calcium > Two gram atoms of nitrogen. > Two grams of SodiumOne atom of silver
 
 


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