what is the perfect of mass when the molecules is 1.74e14*?
CREATE TABLE "composition_by_molecule_type" (
  "molecule" text,
  "percent_of_mass" text,
  "mol_weight_daltons" text,
  "molecules" text,
  "percent_of_molecules" text
);
SELECT "percent_of_mass" FROM "composition_by_molecule_type" WHERE "molecules"='1.74e14*';