# A Guide to Stoichiometry!

## Let's start simple! Reaction type, balancing and state of matter!

Above you should see a simple synthesis equation. We know it's a synthesis reaction because there are two compounds on the left, that's Calcium Oxide (CaO), and Carbon Dioxide (CO2) these two react together to form one new compound, Calcium Carbonate or Ca(CO3). Look back at the equation above and notice how all the elements are equal on both sides, 1 Calcium, 1 Carbon and 3 Oxygens. Last but not least we need to label our state's of matter. On the reactan side, CaO is currently at a solid state while CO2 is at a gaseous state, however in the end they both make Ca(CO3) which is at a solid state.

## Mass to Molars! I mean Mass to Mass!

Before we get to the boring math part we need to get all of our molar masses. I saved you the trouble and found them all for you, no need to thank me! If you're feeling smart then you can find the molar masses using the periodic table.

• CaO- 40.0
• CO2- 12.011
• Ca(CO3)- 100.086
Now with our molar masses we can practice mass to mass conversions! Here's an example!

7 g CaO | 1 mol. CaO | 1 mol Ca(CO3) | 100.086 g Ca(CO3)

------------------------------------------------------------------------------------ = 17.4 g Ca(CO3)

(Blank) | 40.078 CaO | 1 mol CaO | 1 mol Ca(CO3)

Using the same procedure Mr. This video is too quiet uses, I found there would be 17.4 g. of Ca(CO3) if we had 7 grams of Calcium Oxide. We would also have 17.4 g. of Ca(CO3) if we started with 7 g. of CO2 because all of the coefficients in our equations are 1.

## Moles to Moles Conversion

Now I shall teach ye the ways of the moles to moles conversions.

11.30 mol CaO | 1 mol Ca(CO3)

---------------------------------------------- =11.30 mol Ca(CO3)

(Leave blank) | 1 mol CaO

It'd be boring for me to tell you so how about a nice young lady explains it to you instead?

Using that same exact method is how we got 11.30 mol. of Ca(CO3) from 11.30 mol. of CaO

## So what is CaO + CO2 --> Ca(CO3) anyways?

Ca(CO3) is something we all know and dislike... chalk! You know that powdery piece of rock used to color the cement but stains clothes with no mercy! Well now you can show off to your friends that you're smart enough to know the chemistry of chalk. Won't they be jealous?!