Suppose you wanted to dissolve 106 g of na2co3 in enough h2o to make 6.00 l of solution.
(1) what is the molar mass of na2co3? (2) what is the molarity of this solution?

Molar mass of Sodium Carbonate is 106, molarity is 1.0M. Seriously just look at a periodic table this is easy stuff.

M(Na2CO3)=2M(Na)+M(C)+3M(O)
                 =2(23)+12+3(16)
                 =46+12+48
                 =106 g/mol
the molar mass of Na2CO3 is 106 g/mol
m=106g      M=106 g/mol  n=m/M
n=m/M    n=106/106    n=1mol

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The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.