Answer:
84.01 g/mol
Explanation:
Look at your periodic table for the atomic mass for Na, H, and C, and O
Na = 22.99
H = 1.01
C = 12.01
O = 16.00
They are three oxygen atoms. So 16(3) = 48
Now do basic math.
22.99 + 1.01 + 12.01 + 16.00(3) = 84.01 g/mol.
Literally found this in a YouTuube video lol. Hope it helped doe!