what is the molecules when the percent mass is 1.0?
CREATE TABLE "composition_by_molecule_type" (
  "molecule" text,
  "percent_of_mass" text,
  "mol_weight_daltons" text,
  "molecules" text,
  "percent_of_molecules" text
);
SELECT "molecules" FROM "composition_by_molecule_type" WHERE "percent_of_mass"='1.0';