Percent Composition

Today we’ll be using our Homework from last night (Molar Mass Worksheet) to determine the Percent Composition of different atoms in those molecules. It’s really easy see the example below to help you with today’s assignment. The Answer key can be found on the Docs page. Use this as a tool to check work, not to copy.

Molar Mass: CaCl2 %Composition: CaCl2
1 CaCl2 Molecule:
1 Ca  = 1 x 40.1 = 40.1
2 Cl
2 = 2 x 35.5 = 71.0
                            111.1g/mole
%Ca= (40.1/111.1) x 100 = 36.1%Ca
%Cl= (71.0/111.1) x 100 = 63.9%Cl
Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s