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”##

Show more

Calculate Your Essay Price
(550 words)

Approximate price: $22

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:
The price is based on these factors:
Academic level
Number of pages
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
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.

Read more

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.

Read more

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.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more

Order your essay today and save 10% with the coupon code: best10