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3. Hess' Law (Heat of Reaction) Practice a. Use the following data to determine the enthalpy (?H°) of reaction for: NO2(g) + 7/2H2(g) ---> 2H2O(?) + NH3(g) ?H° = ??? kJ Using the following two equations: 2NH3(g) ---> N2(g) + 3H2(g) ?H° = +92 kJ 1/2N2(g) + 2H2O(?) ---> NO2(g) + 2H2(g) ?H° = +170 kJ b. Calculate the enthalpy of the following chemical reaction: CS2(?) + 3O2(g) ---> CO2(g) + 2SO2(g) Given: C(s) + O2(g) ---> CO2(g) ?H = -393.5 kJ/mol S(s) + O2(g) ---> SO2(g) ?H = -296.8 kJ/mol C(s) + 2S(s) ---> CS2(?) ?H = +87.9 kJ/mol c. Determine ?H for the reaction: 4CO + 8H2 ---> 3CH4 + CO2 + 2H2O Given the following data: (a) C + 1/2O2 ---> CO ?H = -110.5 kJ (b) CO + 1/2O2 ---> CO2 ?H = -282.9 kJ (c) H2 + 1/2O2 ---> H2O ?H = -285.8 kJ (d) C + 2H2 ---> CH4 ?H = -74.8 kJ (e) CH4 + 2O2 ---> CO2 + 2H2O ?H = -890.3 kJ

          3. Hess' Law (Heat of Reaction) Practice
a. Use the following data to determine the enthalpy (?H°) of reaction for:
NO2(g) + 7/2H2(g) ---> 2H2O(?) + NH3(g) ?H° = ??? kJ

Using the following two equations:
2NH3(g) ---> N2(g) + 3H2(g) ?H° = +92 kJ
1/2N2(g) + 2H2O(?) ---> NO2(g) + 2H2(g) ?H° = +170 kJ

b. Calculate the enthalpy of the following chemical reaction:
CS2(?) + 3O2(g) ---> CO2(g) + 2SO2(g)
Given:
C(s) + O2(g) ---> CO2(g) ?H = -393.5 kJ/mol
S(s) + O2(g) ---> SO2(g) ?H = -296.8 kJ/mol
C(s) + 2S(s) ---> CS2(?) ?H = +87.9 kJ/mol

c. Determine ?H for the reaction:
4CO + 8H2 ---> 3CH4 + CO2 + 2H2O

Given the following data:
(a) C + 1/2O2 ---> CO ?H = -110.5 kJ
(b) CO + 1/2O2 ---> CO2 ?H = -282.9 kJ
(c) H2 + 1/2O2 ---> H2O ?H = -285.8 kJ
(d) C + 2H2 ---> CH4 ?H = -74.8 kJ
(e) CH4 + 2O2 ---> CO2 + 2H2O ?H = -890.3 kJ

3. Hess' Law (Heat of Reaction) Practice
a. Use the following data to determine the enthalpy (?H°) of reaction for:
NO2(g) + 7/2H2(g) —> 2H2O(?) + NH3(g) ?H° = ??? kJ

Using the following two equations:
2NH3(g) —> N2(g) + 3H2(g) ?H° = +92 kJ
1/2N2(g) + 2H2O(?) —> NO2(g) + 2H2(g) ?H° = +170 kJ

b. Calculate the enthalpy of the following chemical reaction:
CS2(?) + 3O2(g) —> CO2(g) + 2SO2(g)
Given:
C(s) + O2(g) —> CO2(g) ?H = -393.5 kJ/mol
S(s) + O2(g) —> SO2(g) ?H = -296.8 kJ/mol
C(s) + 2S(s) —> CS2(?) ?H = +87.9 kJ/mol

c. Determine ?H for the reaction:
4CO + 8H2 —> 3CH4 + CO2 + 2H2O

Given the following data:
(a) C + 1/2O2 —> CO ?H = -110.5 kJ
(b) CO + 1/2O2 —> CO2 ?H = -282.9 kJ
(c) H2 + 1/2O2 —> H2O ?H = -285.8 kJ
(d) C + 2H2 —> CH4 ?H = -74.8 kJ
(e) CH4 + 2O2 —> CO2 + 2H2O ?H = -890.3 kJ

Added by Ryan R.

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