Academic Chemistry Hess S Law Worksheet Name: ______
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Academic Chemistry Hess’s Law Worksheet Name: ______
1. From the following enthalpy changes,
o C + ½ O2 CO H = -110.5 kJ
o CO + ½ O2 CO2 H = -283.0 kJ
o calculate the value of H for the reaction: C + O2 CO2
2. From the following enthalpy changes,
o 2P + 3Cl2 2PCl3 H = -640 kJ
o 2P + 5Cl2 2PCl5 H = -886 kJ
o calculate the value of H for the reaction: PCl3 + Cl2 PCl5
3. From the following enthalpy changes,
o C2H5OH + 3O2 2CO2 + 3H2O H = -1234.7 kJ
o CH3OCH3 + 3O2 2CO2 + 3H2O H = -1328.3 kJ
o calculate the value of H for the reaction: C2H5OH CH3OCH3
4. From the following enthalpy changes,
o Cu + Cl2 CuCl2 H = -206 kJ
o 2Cu + Cl2 2CuCl H = -136 kJ
o calculate the value of H for the reaction: CuCl2 + Cu 2CuCl 5. From the following enthalpy changes,
o H2 + F2 2HF H = -542.2 kJ
o 2H2 + O2 2H2O H = -571.6 kJ
o calculate the value of H for the reaction: 2F2 + 2H2O 4HF + O2
6. From the following enthalpy changes,
o Xe + F2 XeF2 H = -123 kJ
o Xe + 2F2 XeF4 H = -262 kJ
o calculate the value of H for the reaction: XeF2 + F2 XeF4
7. From the following enthalpy changes,
o 4NH3 + 5O2 4NO + 6H2O H = -1170 kJ
o 4NH3 + 3O2 2N2 + 6H2O H = -1530 kJ
o calculate the value of H for the reaction: N2 + O2 2NO
8. From the following enthalpy changes,
o 2Al + 1.5O2 Al2O3 H = -1601 kJ
o 2Fe + 1.5O2 Fe2O3 H = -821 kJ
o calculate the value of H for the reaction: 2Al + Fe2O3 2Fe + Al2O3 9. From the following enthalpy changes,
o H2O2 H2O + ½ O2 H = -94.6 kJ
o H2 + ½ O2 H2O H = -286.0 kJ
o calculate the value of H for the reaction: H2 + H2O2 2H2O
10. From the following enthalpy changes,
o C + O2 CO2 H = -393.5 kJ
o H2 + ½ O2 H2O H = -285.8 kJ
o 2C2H2 + 5O2 4CO2 + 2H2O H = -2598.8 kJ
o calculate the value of H for the reaction: 2C + H2 C2H2