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Find formula unit mass of NaHCO3?
Formula mass unit is the sum of all the atomic weights that make up the substance.
In the case of ##NaHCO_3##, you need to count first how many atoms are there in the formula.
Na = 1 H = 1 C = 1 O = 3
Next is to get the atomic weights (just take a look at the periodic table).
Atomic weight of Na = 22.989769 amu (atomic mass unit) Atomic weight of H = 1.00794 amu Atomic weight of C = 12.0107 amu Atomic weight of O = 15.9994 amu
Then add the atomic weights according to the formula. 22.989769 amu + 1.00794 amu + 12.0107 amu + (3 x 15.9994 amu)
= 84.0 amu