---
title: "Hess's law: ΔfH of carbon monoxide Template | MolDraw"
url: https://www.moldraw.com/templates/genchem-hess-co/
description: "Hess's law: ΔfH of carbon monoxide template: Hess cycle and enthalpy-level diagram for C(s) + ½ O₂ → CO from ΔcH(C) = −393.5 and ΔcH(CO) = −283.0 kJ mol⁻¹…"
lang: en
publisher: Scidart Academy
generated: 2026-10-28
---
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# Hess's law: ΔfH of carbon monoxide template

![Hess's law: ΔfH of carbon monoxide template: Hess cycle and enthalpy-level diagram for C(s) + ½ O₂ → CO from ΔcH(C) = −393.5 and ΔcH(CO) = −283.0 kJ mol⁻¹, giving ΔfH°(CO) = −110.5 kJ mol⁻¹.](https://www.moldraw.com/templates/genchem-hess-co.webp)

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Hess cycle and enthalpy-level diagram for C(s) + ½ O₂ → CO from ΔcH(C) = −393.5 and ΔcH(CO) = −283.0 kJ mol⁻¹, giving ΔfH°(CO) = −110.5 kJ mol⁻¹.

## What the template shows

- An enthalpy change that cannot be measured directly, from two combustion enthalpies that can
- Hess cycle
- Enthalpy levels (to scale)
- Hess's law: the enthalpy change of a reaction depends only on the start and end states, not the route (enthalpy is a state function).
- Burning carbon in limited oxygen always gives some CO₂, so ΔfH(CO) is found from combustion data instead.
- Route 1 (direct to CO₂) = route 2 (via CO): ΔH₂ = ΔH₁ + ΔH₃, so ΔH₁ = −393.5 − (−283.0) = −110.5 kJ mol⁻¹.
- Reversing an equation changes the sign of ΔH; multiplying it scales ΔH. Values: NIST, 298 K, 1 bar.
- Every part of this figure is editable · sources on the template card

Drawn with 27 shapes – every one editable in MolDraw.

## Sources

- [Atkins, de Paula & Keeler, Atkins' Physical Chemistry, 11th ed., OUP 2018, ch. 2](https://openlibrary.org/isbn/9780198769866) Textbook
- [NIST Chemistry WebBook: carbon monoxide](https://webbook.nist.gov/cgi/cbook.cgi?ID=C630080) Database
- [NIST Chemistry WebBook: carbon dioxide](https://webbook.nist.gov/cgi/cbook.cgi?ID=C124389) Database

## How to use this template

1. Press **Edit in MolDraw**. The template opens on the canvas of the free MolDraw editor.
2. Change anything: move structures, edit atoms and labels, recolour highlights or delete what you do not need.
3. Add your own structures, arrows and text next to it, or combine several templates on one page.
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## Frequently asked questions

### Is the Hess's law: ΔfH of carbon monoxide template free?

You can preview the Hess's law: ΔfH of carbon monoxide template here and open and edit it in MolDraw for free. Downloading or exporting it is part of MolDraw Pro, together with the other premium templates.

### Can I edit the Hess's law: ΔfH of carbon monoxide template?

Yes. It opens as an ordinary MolDraw drawing, so every structure, arrow, label and colour can be changed, and you can add your own content around it.

### Is the chemistry checked?

Every structure is checked with RDKit and every curly arrow passes MolDraw’s electron-flow audit. The sources used are listed on this page.

### Which MO diagrams are included?

H₂ and He₂, N₂ and O₂ (showing s–p mixing and paramagnetic O₂), and carbon monoxide.

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