Spanish · Pronunciation Guide
bah-SEE-oh, three beats — it starts with a b sound and the accent splits the i from the o.
Three syllables, va-CÍ-o, and the accent forces a hiatus. A weak i beside a strong o would normally form a diphthong and give a two-syllable "vacio"; the mark splits them apart and places the stress on the i. The feminine "vacía" does exactly the same thing, and the plurals keep the accent for the same reason.
Listen: vacío
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El refrigerador está vacío.
The refrigerator is empty.
Listen: El refrigerador está vacío.
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"El refrigerador está vacío" uses estar, since emptiness is a current state rather than an essential property. "Refrigerador" is a five-syllable workout: the opening r is trilled, the g before e is a throaty sound like the j, and the final r ending puts the stress on the last syllable, re-fri-he-ra-DOR.
Two things collapse at once. The v gets buzzed like an English v, and the ío gets squashed into one syllable, giving "va-SYO". Say a b at the front and give the i and o separate beats. The c also gets hardened into a k by readers who have not internalised that c before i is an s. Three corrections, and a three-syllable word emerges from a two-syllable guess.