A mixture of sodium chloride ($\mathrm{NaCl}$) and anhydrous sodium carbonate ${\mathrm{Na}}_2{\mathrm{CO}}_3$ has a mole ratio, 2 : 1. It is dissolved in water and treated with ${\mathrm{BaCl}}_2$ solution. The mass of ${\mathrm{BCO}}_3$ precipitated is 197 gm. Calculate the mass (in gm ) of $\mathrm{NaCl}$ in the mixture.