When S(s,rhombic) reacts with CO(g) to form SO2(g) and C(s,graphite) , 75.8 kJ of energy are
evolved for each mole of S(s,rhombic) that reacts. Write a balanced thermochemical equation for
the reaction with an energy term in kJ as part of the equation. Note that the answer box for the
energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the
energy term (including the units) in the last box on the appropriate side of the equation. If a box
is not needed, leave it blank.
Solution
The reaction
S + 2CO = SO2 + 2C
Energy data --> H = -75.8
add phases
S(s,rhombic) + 2CO(g) = SO2(g) + 2C(s) Hrxn = -75.8 kJ/mol