1) The molar mass of NaHCO3 is 84.01 g/mol.
You have 2.4 moles of NaHCO3.
How many grams of NaHCO3 is that?


2) The molar mass of K is 39.1 g/mol.
You have 1.8 moles of K.
How many grams of K is that ?