Imposibilities or Impossibilities: How To spell?
The word Imposibilities is misspelled against Impossibilities, which is plural of "Impossibility"
Impossibilities has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings impo & ibilities which should not be misspelled with single 'S'
Wrong Spelling:  impo-s-ibilities  Correct Spelling:  impo-ss-ibilities 
Find more incorrect spellings of Impossibilities to spell right way.