No need to vote on it: stress accent in classical Latin is determined by two simple rules which cover almost all words, and which you can find in any Latin grammar: 1) words of two syllables have the accent on the first syllable, and 2) words of more than two syllables have the accent on the penult (next to last) syllable if the penult is long, otherwise on the antepenult (the syllable before the penult.) Since the u in mortuis is short, the accent goes on the antepenult, MOR-tu-is.

As for Latin pronunciation in general, scholars in English language countries typically use a pronunciation which approximates the classical pronunciation but doesn't try to reproduce it exactly. It sounds odd if you get the accents wrong, though. Any Latin grammar will have a section on pronunciation; particularly complete and lucid is the one in Lane's A Latin Grammar for Schools and Colleges (1903), though some professional philologists may tell you it needs to be updated in the light of subsequent research.


Jon Corelis
Shards of Time: Translations