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The letter 'c' has different pronunciations depending on the vowel it's with:
ca = /ka/; ce = /se/; ci = /si/; co = /ko/; cu = /ku/ (be careful with the last one)
Examples: casa = /káza/; cebola = /sebôla/; cinema = /sinêma/; cozinha = /kozíña/; cume = /kúme/
As you can see, the 'k' sound only appears with the vowels "a", "o" and "u".
Sometimes, in Portuguese, there are words with "c" syllables which would naturally sound like a "k" but we want them to sound like an "s". In that case, we add a little "tail" in the letter 'c' (called "cedilha"), forming the letter 'ç' (ce-cedilha), which basically is a variation of 'c' that sounds like an 's' when it's with an "o", "a" or "u", instead of having a 'k' sound. Because of this, there are only three possible combinations of letters in which "ç" appears:
ça = /sa/; ço = /so/; çu = /su/
Examples: onça = /õsa/; abraço = /abráso/; açúcar = /asúkar/
Logically, the combinations "çe" and "çi" will never ever ever ever exist! And something else important about "ç" is that it never ever ever ever goes in the beginning of the word!
Heres a website that will do wonders with this kind of thing: forvo.com. It actually has about 10 pronunciations for maçã already.
Anyways, stress appears to be on that second syllable. Another difference, too, appears to be that it is a nasalized vowel (open the airway to your nose when saying it—French does this a heck of a lot). Just in case that helps out.