Answer to Question #316714 in General Chemistry for Jujjuuuuu

Question

Write the thermochemical equation for the following reactions that occur at constant pressure.

1. Combustion of hexane, C5H12 to carbon dioxide gas and water, releases 3923.9kJ of heat.

2. Reaction between solid phosphorus, P4 and oxygen gas, produces P3O6 and 1640.1kJ of heat.

3. One mole ammonium nitrate (NH4NO3) dissolves in water to produce aqueous ammonium ions and nitrate ions accompanied by the absorption of 28.1kJ of heat.

4. Formation of carbon dioxide gas from carbon (graphite) and oxygen yields 393.5kJ of heat.

Answer 1

NH4NO3 = NH4+ + NO3- - 28.1 kJThe reaction C (graphite) + O2 (g) → CO2 (g) + 393.5 kJ mol^-1 represents the formation of CO2 and also combustion of carbon. The reaction C (graphite) + O2 (g) → CO2 (g) + 393.5 kJ mol-1 represents the formation of CO2 and also combustion of carbon