CH10 – Percent Composition

Dates

• P1 – Friday, February 3rd
• P3 – Thursday, February 2nd
• P5 – Friday, February 3rd

Recap

• Mole map / units / reactions
• How do I draw?
• Example problem

New Idea – Mass Percent Composition

• determine the percent by mass of a compound given the formula
• assume 1 mole – convert to grams – add up – divide by total
• example

New Idea – Empirical Formula

• opposite of mass percent process
• assume 100g – grams to moles – divide by smoles – multiple til whole
• example

Homework 1

• No Homework (be ready to apply during next class)
• Bring LNB to class (for sure!) next time

Homework 2

• Look at the videos posted in the group
• Leave a positive (specific) comment on at least one of the posts about what worked well in the video