Density and Moles

Density

• is a measure of mass per volume 
• measure in G/L or G/ML

ex. water has a density of 1.0g/mL

How many moles are in 11.5 mL of water?
11.5 mL x 1mol/ 18g = .64 mol

Density of gases (STP)

• The density of gases varies with temperature
• At STP we can find density by: MM/ 22.4 L/mol 
• molar mass/ molar volume
• density of gases 02 @ STP

2(16) = 32g/mol / 22.4L/mol = 1.43 g/l