Question

Which of the following is a correctly written thermochemical equation?

A. C3H8 (g) + O2 (g) → CO2 (g) + H2O (l), ΔH = –2,220 kJ/mol


B. 2C8H18 +25O2 → 16CO2 + 18H2O, ΔH = –5,471 kJ/mol


C. C5H12 (g) + 8O2 (g) → 5CO2 (g) + 6H2O (l), ΔH = –3,536.1 kJ/mol

Answer 1

The correct answer is option C.

C. C5H12 (g) + 8O2 (g) → 5CO2 (g) + 6H2O (l), ΔH = –3,536.1 kJ/mol

This equation represents the balanced thermochemical equation for the reaction between C5H12 (g) and O2 (g), producing CO2 (g) and H2O (l), with the given enthalpy change (ΔH) value of -3,536.1 kJ/mol. The coefficients are correctly balanced on both sides of the equation, indicating the stoichiometric relationship between the reactants and products.

Answer 2

C. C5H12 (g) + 8O2 (g) → 5CO2 (g) + 6H2O (l), ΔH = –3,536.1 kJ/mol

Step-by-step explanation:

This equation represents the combustion of C5H12 (pentane) in the presence of oxygen to produce carbon dioxide (CO2) and water (H2O), with a heat change (ΔH) of -3,536.1 kJ/mol.