Awwee Yeah Enthalpy Calculations Yeah ;)

So today, in class we learned about enthalpy calculations! Sounds scary right? But, naw! Its as easy as you can cry :) Here we gooooo............

To start off, lets define the key terms you will need to internalize!

Enthalpy: the "heat content" of a substance; in other words, the sum of kinetic and potential energy!

In an exothermic reaction, the enthalpy goes down, and it is converted into heat and released. 

In an endothermic reaction, the enthalpy goes up and it is absorbed.

To find the total change in enthalpy, you just subtract the reactant from the product. 

/\H = Hproduct - Hreactant 

Use this following picture as an example:

Where would you find the enthalpy in this diagram?

The location is labelled as C.

Find the enthalpy.

/\H = Hproduct - Hreactant 

/\H = 300 - 100 

/\H = 200 kJ

Example 2

If you had 3 moles of Carbon, and the energy produced per one mole -478KJ. Then how much energy is produced in total?

-478KJ X 3 moles = -1434KJ

 1 mole


^{Notice how the energy is negative; because it was produced, not absorbed}

I hope you guyss comprehend all this! GOOODLUCKKK!!