Pinch Of KCN: Mole Conversion, Part UNO!!!

Hi everyone! Today, we are going to talk about an interesting, exciting, fascinating, amazing, wonderful, fantastic topic; I'm sure you've got it! It's MOLE CONVERSION!!!

It is very important that you make good friends with the "moles" and be able to convert them correctly without being bitten in the arm!

Anyways, enough of chatting. Let's get started and I promise you that you'll be excellent friends with the "moles" at the end of this blog.

STEPS TO BEING FRIENDS WITH MOLES

【Particle/Atom/Formula unit → Mole】

Whenever we are given a bunch of atoms and we need to find the number of moles,
we just need to simply divide the number of atoms by Avogadro's number.

Example: How many moles of Oxygen atoms are in 4.56 x 10¹² O atoms?
First: we write down the information we know
4.56 x 10¹² O atoms

Secondly: we divide the # of atoms by Avogadro's number (6.022 x 10²³)
4.56 x 10¹² O atoms x 1 mol O
6.022 x 10²³

Thirdly: we punch in the numbers into our best friend calculator
4.56 x 10¹² O atoms x 1 mol O = 7.572235138....x10^-12
6.022 x 10²³

Lastly: we record the answer with correct number of sig figs
since "4.56" has the least # of sig figs, our final answer is 7.57 x 10^-12mol O

You are getting the hang of it right?! That's good, because an amazing time-travelling trip has been scheduled for ALL of you. Wait, we're on time...please a take a seat in the time-travelling shuttle...

【Mole → Particle/Atom/Formula unit】

Now, let's do a reversed version of what we just did above. When we are given a number of moles to find how many atoms are present, we'll need to multiply the # of moles by Avogadro's number.

Example: How many molecules are present in 3.2 mol of HCl?

3.2 mol HCl x 6.022 x ²³ = 1.9 x 10²⁴ molecules HCl
1 mol HCl

However, if the question wants us to find a specific TYPE of atoms in a compound, we'll need to do one more step.

Example: How many molecules of Oxygen are present in 5.6 mol of SO₄?

Since the question wants us to only find the number of oxygen molecules, but not including the sulphurs, so we'll have to multiply the total number of mols by the number of atoms per molecule.

↓There are 4 oxygen atoms per 1 SO₄ molecule
5.6 mol SO₄ x 6.022 x 10²³ x 4 atoms O = 1.3 x 10²⁵ atoms O
1 mol SO₄ 1 molecular SO₄

We are almost there. Let's just take a quick break from this...FUN FACT TIME: did you know that mole does not only can refer to the chemistry unit mole, animal mole (digging those ugly holes in the ground making people to fall inside their "traps"), it can also refer to as a type of sauce(eatable ones, of course)!!! Mole sauce apparently is a sauce used in the Mexican cuisine and is essentially just chili peppers gravy. Nothing too fancy.

Okay, enough laughters, getting back to the real deal...

【Mole → Grams】

Last blog post, we've learnt about molar mass, molecular mass and formula mass. It's time for us to put those numbers in use! When we are ask to convert mol into grams, we can multiply the molar mass of the elements by # of moles.

Example: What is the mass in grams of 4.78 moles of Iron?

Atomic mass of Fe = 55.8 u
molar mass of Fe = 55.8 g/mol

4.78 mol Fe x 55.8 g/mol = 267 g Fe
1 mol Fe

【Grams → Mole】

After we've learnt how to convert mole to grams, it'll be easy for you to do the reverse. To convert grams to mole, you can divide the # of moles by the molar mass of elements.

Example: How many moles are in 18.66 grams of Carbon?

Atomic mass of C = 12.0 u
Molar mass of C = 12.0 g/mol

18.66 g C x 1 mol C = 1.56 mol C
12.0 g C

Awesome! That's pretty much wraps up mole conversion......part one!!! But anyways, here's some jokes about moles and Avogadro to light up you day....as usual :D

Q: What did Avogadro teach his students in math class?
A: Moletiplication (multiplication)

Q: What kind of fruit did Avogadro eat in the summer?
A: Watermolens

Q: What is Avogadro's favorite kind of music?
A: Rock 'N' Mole
Q: What did Avogadro invent for his wife to use as a night cream?
A: Oil of Molay

At last, here's a present from Pinch of KCN to everybody, it's a game about mole conversions!!! *clap clap clap*
It is a very short RPG-styled game which contain 10 unique questions about mole conversions.The file might seems a bit large, so please allow 3-5 mins to download.
※This game is completely made by us, so don't worry, it will NOT spread scary viruses to your computer※

Now please download this game and allow an exceptionally adorable mole to enhance your chemistry learning experience. Look how cute he looks with those fake glasses I accessorized him with:)