First, write down the formula for sodium bicarbonate which is, NaHCO3.
Find the g-f-m if sodium bicarbonate which is 84 g/mol.
To find the moles of sodium carbonate, you would divide the grams by the gfm.
1.3g
——= .015 mol
84 g/mol
(*** I rounded to 2 sig figs as the final answer***)