In the chlor-alkali process, the mass of NaCl(s) required to produce 0.793 kg of chlorine gas is _____ kg.

Write and balance the equation.

Convert 0.793 kg Cl2 to mols. mols = grams/molar mass.
Convert mols Cl2 to NaCl using the coefficients in the balanced equation.
Convert mols NaCl to grams. g = mols x molar mass.