Here's how to calculate the mass of 1.00 mol of sodium hydrogen carbonate (NaHCO₃):

1. Find the molar mass:

* Sodium (Na): 22.99 g/mol

* Hydrogen (H): 1.01 g/mol

* Carbon (C): 12.01 g/mol

* Oxygen (O): 16.00 g/mol (and there are 3 oxygen atoms)

Add the individual molar masses: 22.99 + 1.01 + 12.01 + (16.00 x 3) = 84.01 g/mol

2. Calculate the mass:

Since 1 mole of NaHCO₃ has a mass of 84.01 g, 1.00 mol will also have a mass of 84.01 g.