Hey ashish its too simple, Concentration of any solid, liquid or gas depends over its density and its molecular mass solids & pure liquids have these relation a constant so we do not consider them in our reactions rather we take their concentrations as unity.

 

If you feel that I am wrong somewhere then plz let me know afterall I m also a small kid

if a reaction as such : X(s) + Y(g) --> Z(g)

 

then K(eq)= [z]/[x][y]

conc of x will be the no. density/molar mass , which is a constant  thus conc of x will not vary so we merge Keq with other const to  Kc=[Z]/[Y]

 

 

hope i am rite plz tell if i am wrong

concentration is mol per litre. How could u relate density?

tell me 1 more ques:

what is angular node,radial node,&nodal plane.If there is any formulae to calculate these,plz let me know also.

Hey ashish !

just see this

 

Concentration= Moles / Litre

 

Litre stands for volume(V), moles is no. of moles(n)

 

but n= Mass(m) / Molar mass(M)

 

 

therefore,

                   Concentration =  m/MV

 

but m/V is density (d)

 

so, Concentration is density / Molar mass