Density & Moles- Nov 5

On Thursday class we learned about density of gases at STP and how to convert into mole from different units.

Density ---> mass per unit volume


Density of gases at STP
-1 mole of gas

Calculate the density of O2 at STP


Example:

A mystery gas has a density of 1.696g/L at STP. It is a diatomic element. Identify the gas.
MM = (1.696 g/L)(22.4 L/mol) = 38 g/mol--->19 g/mol---> Flourine, F2


The density of Boron (solid) is 2.34 g/mL. How many molecules are in a 60.0 mL piece?



Liquid Mercury has a density of 13.55 g/mol. Find the volume occupied by 1.806 x 10^27 atoms of G