There are three syllables. Vid-e-o.
I believe the word you are looking for is farewell, and that has 2 syllables. You can learn about counting syllables from the video attachment at the bottom that I have provided.
One syllable. You can count out syllables based on each time you change your tone in voice during a word and clap out the syllables. There is a video explaining I have attached.
4 syllables am- phi- bi- an
Awake has two syllables. The syllables are a-wake.
There are 3 syllables in symphony:sym/pho/ny
there are 2 syllables in stomach. To see why, search 'How many syllables in attack?'
Happened has two syllables. The syllables are hap-pened.
There are two syllables.