Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide.

Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. A. What is the percent percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 5SO3? Show solution. B. List at least three potentially hazardous features associated with concentrated sulfuric acid. Need reference(s) listed