What are the steps to work out molar mass and concentration of a solution

like i want to know what is written to work out the molar mass and the concentration of a solution as separate methods e.g.first you find the moles etc..
hope you can help

molar mass
To work ot the molar mss add up the atomic mass of every atom in the molecule. The molar mass will be in grams

eg
NaCl = 22.99 + 35.45 = 58.44 g/mol
H2SO4 = (2 x 1.008) + 32.07 + (4 x 16.00) = 98.086 g/ml


moles
moles = mass / molar mass

eg moles of NaCl in 4.00 g
moles = 4.00 g / 58.44 g/mol
= 0.0684 mol



Molarity = moles solute / litres of solution

eg 4.00g NaCl in 500 ml of solution
Molarity NaCl = 0.0684 mol / 0.500 L
= 0.137 M