CHEM 1211 Module Seven Sample     Exam  Name: _________________

 

Module Seven Part G: Hess Law of Constant Heat Summation    5 points

 

Using the following equations:

 

          S (s)        +  3/2 O2 (g)     →          SO3 (g)    ∆  Ho =   -395.2 kJ

 

      2 SO2 (g)     +       O2 (g)     →        2 SO3 (g)   ∆ Ho =    -198.2 kJ

 

calculate the ∆  Ho for the reaction:

 

          S (s)          +       O2 (g)    →                 SO2 (g)