November. 4,2009

In the beginning of class, Mr. doktor handed back our mole ration lab. After, we marked the unit 2 homework sheet numbers 11-15.
Mr. Doktor taught a new topic about DENSITY & MOLES:
To find either the density, volume or even mass we can use this triangle.
To use this triangle, you cover the one that you are trying to find.

Let us say that you need to find the mass. You cover the mass and your left with density times volume. Just remember to cover the one that you are trying to find and the triangle will tell you how.

DENSITY OF GASES @STP
To find the density of gases @ STP you can use this formula:

DensitySTP = mass of 1 mole/volume of 1 mole = molar mass/ 22.4 L = gram per mole/liter per mole = gram/litre

DENSITY OF GASES @ STP