What is the mass of water produced when 168g of sodium hydrocarbon ate breaks down?

The balanced chemical equation for the breakdown of sodium bicarbonate (NaHCO3) is:

2 NaHCO3 -> Na2CO3 + CO2 + H2O

From this equation, it can be seen that one mole of NaHCO3 produces one mole of H2O. The molar mass of NaHCO3 is 84 g/mol. Therefore, 168 g of NaHCO3 will produce 84 g of H2O.