When 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at constant temperature and pressure, 44.7 kJ are given off. What is the thermochemical equation?

##2″KClO”_text(3(s]) -> 2″KCl”_text((s]) + 3″O”_text(2(g]). ” “DeltaH_text(rxn) = -“44.7 kJ”##

A thermochemical equation is simply a chemical equation that contains information about the change of reaction, ##DeltaH_”rxn”##.

The first thing to do when writing a thermochemical equation is to make sure that you get the balnced chemical equation right.

In your case, you know that 2 moles of potassium chlorate, ##”KClO”_3##, undergo to form potassium chloride, ##”KCl”##, and oxygen gas, ##”O”_2##.

So you know that you have

##2″KClO”_text(3(s]) -> “KCl”_text((s]) + “O”_text(2(g])##

Balance this equation by multiplying the products by ##2## and ##3##, respectively

##2″KClO”_text(3(s]) -> 2″KCl”_text((s]) + 3″O”_text(2(g])##

Now focus on the enthalpy change of reaction. The problem tells you that the reaction given off ##”44.7 kJ”##, which means that the reaction is actually .

As you know, energy changes are being represent from the point of view of the system. This implies that for an exothermic reaction the enthalpy change will carry a negative sign, since the system is losing heat to the surroundings.

Therefore, the enthalpy change of reaction will be

##DeltaH = -“44. 7 kJ”##

As a result, the thermochemical equation for the decomposition of potassium chlorate looks like this

##2″KClO”_text(3(s]) -> 2″KCl”_text((s]) + 3″O”_text(2(g]). ” “DeltaH_text(rxn) = -“44.7 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.