what is the percent of mass when the mol.weight (daltons) is 1e11?
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 "mol_weight_daltons"='1e11';