The word stoichiometry is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 23
Highest Scoring Words With Friends™ Plays In The Letters stoichiometry
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Seven Letter Word Alert: (70 words)
chemist, chooser, chromes, chymist, cithers, coheirs, cohorts, cooties, cotters, coyotes, erotics, hermits, heroics, heroism, history, hitters, homiest, hosiery, isohyet, itchier, meiotic, metrics, metrist, miscite, mistier, mitiest, mitotic, moister, moocher, mooches, moorish, mortise, mothers, mottoes, myotics, omitter, oocytes, osmotic, ostrich, otocyst, reshoot, rhotics, rhymist, richest, risotto, scooter, scyther, shooter, smoochy, smoothy, smother, society, somitic, soother, sootier, stretch, thermic, thermos, thirsty, thorite, thymier, timothy, tithers, titmice, tooters, tootsie, torches, tricots, trisect, trisomy