# C2H5OH (l) + 3O2(g)->2CO2 (g) + 3H2O (l) Delta H -1367kJ H2 (g) + 1/2 O2-> H2O (l) Delta H -286kJ C(graphite) + O2 (g) -> CO2 (g) Delta H -394 Calculate the change in enthalpy for this equation 2C (g) + 3H2 (g) + 1/2 O2-> C2H5OH (l) Delta H??

##ΔH = “-279 kJ”##

This is a Hess’s Law problem.

Our target equation is

2C(graphite) + 2H₂(g) + ½O₂(g) → C₂H₅OH(l); ##ΔH = “?”##

We have the following information:

1. C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O (l); ##ΔH= “-1367 kJ”##2. H₂(g) + ½O₂(g) → H₂O(l); ##ΔH = “-286 kJ”##3. C(graphite) + O₂(g) → CO₂(g); ##ΔH = “-394 kJ”##

Our target equation has 2C(graphite), so we multiply Equation 3 by 2:

4. 2C(graphite) + 2O₂(g) → 2CO₂(g); ##ΔH = “-798 kJ”##

That means that we also multiply ##ΔH## by 2.

Our target equation has no CO₂, so we reverse equation 1 to cancel the CO₂.

5. 2CO₂(g) +3H₂O(l) → C₂H₅OH(l) + 3O₂(g) ; ##ΔH = “+1367 kJ”##

That means that we also change the sign of ##ΔH##.

Our target equation has no H₂O, so we multiply Equation 2 and its ##ΔH## by 3 to cancel the H₂O:

6. 3H₂(g) + ³/₂O₂(g) → 3H₂O(l); ##ΔH = “-858 kJ”##

Now we add equations 4, 5, and 6 and their ΔH values.

This gives

2C(graphite) + 2H₂(g) + ½O₂(g) → C₂H₅OH(l); ##ΔH = “-279 kJ”##

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.