Is the word яблоко in nominative or accusative case in this sentence?
"Я хочу яблоко." I want an apple.
Accusative: 'whom or what' (direct object) is being done to something. "An apple" is being wanted by "I".
Accusative "яблокo" equals Nominative "яблоко", because of this noun ending with "o" (neuter).
It is pronounced like "khachoo". 'Х' is always [kh] (in between an English k and h). 'О' sounds like [oh] in 'low' when stressed, [uh] (schwa) in the last syllable of 'Sarah' when unstressed, and [ah] in 'pollen' when immediately before the stressed syllable.
(Late response, sorry!)
хочу = kh-ah-ch-ew
That was my favorite waу of expressing it in the Latin/english alphabet.
By the way, I love the Cyrillic alphabet so much! Good luck with your learning!