What is the percent CO2 in sodium bicarbonate?

Sodium Bicarbonate come from absorption of CO2 into NaOH

Total reaction is 2NaOH + CO2 -> NaHCO3 + H2O

Each mole of NaHCO3 come from absorption of 1 mole CO2

Molecular weight of NaHCO3 is 84 g/mol and CO2 is 44 g/mol

It is that 84 g of NaHCO3 had 44 g of CO2

By weight ratio it is 52% CO2 in Sodium Bicarbonate.