Calculate Δ H for C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) using: Δ Hf° (C₂H₅OH,l) = -277.7 kJ/mol, Δ Hf° (CO₂,g) = -393.5

Practice question

Question

Calculate Δ H for C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) using: Δ Hf° (C₂H₅OH,l) = -277.7 kJ/mol, Δ Hf° (CO₂,g) = -393.5 kJ/mol, Δ Hf° (H₂O,l) = -285.8 kJ/mol.

Choose one · Correct answer highlighted

-1089 kJ/mol 1366.7 kJ/mol -1366.7 kJ/mol Correct -277.7 kJ/mol

Δ H = [2(-393.5) + 3(-285.8)] - [-277.7 + 3(0)] = -787 - 857.4 + 277.7 = -1366.7 kJ/mol.

Share this question

Guides and insights connected to this topic

Virology 25 Jan 2026

Coronavirus Overview Coronaviruses (CoVs) are enveloped viruses (surrounded by a lipid membrane derived from host cells), belonging to the s...

Virology 25 Jan 2026

Structure of Coronavirus Coronaviruses (enveloped RNA viruses) fall in the virus family Coronaviridae, order Nidovirales. They are enveloped...

Virology 25 Jan 2026

Cucumber Mosaic Virus (CMV): Introduction and Importance Cucumber Mosaic Virus (CMV) (plant-infecting RNA virus) is one of the most economic...