Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.) c) Finally, is this reaction exothermic or endothermic, under what condition is the answer to part b) the heat of the reaction? (10 pts.)

The answer to your question is below

Explanation:

Propane = C₃H₈

Process

1. - Write the chemical reaction

C₃H₈ + O₂ ⇒ CO₂ + H₂O

balanced chemical reaction

C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O

Reactants Elements Products

3 C 3

8 H 8

10 O 10

b) Standard enthalpy

Propane - 104.7 kJ/mol

Oxygen 0 kJ/mol

Carbon dioxide - 393.5 kJ/mol

Water - 241.8 kJ/mol

ΔH° = ∑ΔH° products - ∑H° reactants

ΔH° = 3 (-393.5) + 4 (-241.8) - [ (-104.7) + 0]

-Simplification

ΔH° = - 1180.5 kJ/mol - 967.2 kJ/mol + 104.7 kJ/mol

ΔH° = - 2042.5 kJ/mol

This reaction is exothermic because ΔH° is negative.