Molar volume!

Today we learned how to calculate molar volume!

Some things to know first are
•gases expand and contract (change volume) with changes in temperature and pressure
•we have a standard condition to compare volume of gases called STP ( standard temperature and pressure)
•STP= 1 atmosphere of pressure and a temperature of 0 degree celsius or 273.15k
•at STP, 1 mole gas occupies 22.4 L

This may sound really confusing ( that's what I first thought) but it makes a lot more sense when you learn the formula

Formula= 22.4 L of gas/1 mol of gas
Or 1 mol of gas/22.4 L if gas

These formulas are an add on to the mole map!
But it only attaches to the mole conversion section.

Ex. You have a volume occupied by 6.2g of Sulfur at STP

So...
Step 1- convert grams to moles
6.4g x 1 mol/32g= 0.2moles
Step 2- convert moles to liters using our new formula!
0.2 moles x 22.4L/ 1 mol= 4.48!!

but...

Make sure you remember your sig figs!
4.48 will round up to 4.5!!

Here is a slightly harder example with explanation!

Don't forget that, for our chapter 4 test on monday!