I think Mr Chee is correct. You only use the accent mark in Spanish if the accent is on an unexpected syllable. You don't bother using it for the predictable, regular accent. Unfortunately I am currently in a caffeine-deprived state that is interfering with my ability to remember what the stress rule for Spanish is - goddamit people why won't you let me leave my past behind anyway - but I think it sounds right that we don't really need the accent mark.
Trust me on Spanish, mate. I have put very much thought and research into language in general and Spanish in particular.
The major rules for accenting in Spanish [Castellano] are as follows.
1) If the word ends in
n,
s, or a
vowel the word is by default pronounced with an accent on the second-to-last syllable and no accent mark is placed.
1a) If the accent is NOT on the penultimate syllable then the accent mark is on whatever vowel is accented.
2) If the word does not end in a letter from
(1) then the accent by default is on the last syllable and no accent mark is placed.
2b) If the accent is not on the last syllable the accent mark is similarly placed on whatever vowel is accented
3) If two words are spelt exactly the same one must have an accent mark on the stressed syllable to differentiate the two. Generally the word that is more forceful or emphatic is the one spelt with the mark