The answers are below, i got 13/18, some are just badly worded, number 14 for example...i had an 'ing' at the end of the penultimate word.
*****************************Answers below**********************************
1) 1024 bytes in a kilobyte
2) the square root of -1 is an imaginary number
3) 666 is the number of the beast
4) 12 numbers on a clock
5) 4 chambers in the human heart (i cheated on this one)
6) 40 days of lent
7) 99 bottles of beer on the wall
8) 2 lenses in a standard pair of glasses (i cheated again)
9) 12 desciples of jesus
10) 2 players in a duet (cheated here too)
11) snow white and the 7 dwarfs
12) 2 sides of a coin
13) 4 suits in a deck of cards
14) 8 hours in a regular work day
15) 150 psalms in the bible (cheated here aswell, was damn close though)
16) Every Single Hollywood Movie Phone Number Starts with 555 (wtf? how was i supposed to get that??)
17) 42 is the answer to life, the universe, and everything
18) 3 major temperature scales - celsius, fahrenheit and kelvin
