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The molar mass of NaNO3 is equal to the sum of the molar masses of all the elements that make up one molecule of the compound. To find the masses of these elements, consult the Periodic Table. The molar masses of Sodium, Nitrogen and Oxygen are 22.99, 14.01 and 16 grams, respectively. To find the molar mass of NaNO3, add the molar masses of all the atoms used in the compound 22.99g + 14.01g + (3 x16g), which is equal to 85g.
Sodium bromide has a molar mass 102.9 g mol^(-1), which means that one mole of sodium bromide has a mass of 102.9 g. You can thus use the molar mass of a compound to convert between its mass and the number of moles equivalent to that mass.