What is the relationship between relative atomic mass and molar concentration?describe the relationship.

The relative atomic mass is the combined mass of the total
number of protons, neutrons and electrons.  The mass of either a protron or neutron is 1
atomic mass unit (amu), whereas the mass of an electron is only 0.00055 amu, which is
not usually counted.   For example, carbon has 6 protons, 6 neutrons and 6 electrons. 
Adding these together, you have 6 amu for protons, 6 amu for neutrons and 6 x .00055 amu
= .003 for the electrons.  In total, carbon is about 12
amu.

A molar concentration is simply the total
amu of the substance disolved in a liter of solvent.  For example, a 1 M concentration
of NaOH would be the total of the atomic masses of the individual atoms in 1 liter of
water.  The masees are as follows: Na = 23, O = 16 and H = 1.  Therefore, 23+16+1=50. 
If you were to take 50 g of NaOH and dissolve it in 1 liter of water, you would have a 1
M solution.