CP10 – The MOLE

Date

• Tuesday, January 30th

Quiz

• recap answer
• sig figs and units process

Counting by Weighing

• determine the mass (30 particles)
• determine the mass per particle
• determine the number of particles in sample by mass
• count the total number of particles

New Idea – The Mole

• words as numbers
• magic translator number
• mass of one mole = periodic table number in grams

How big is a mole?

• If I start with a mole of dollar bills and spend a million dollars every second, how long would it take for the money to run out (years)? Note: this is a dollars-to-years conversion using dimensional analysis (units!)

New Idea – Mole Math

• particles <–> moles
• mass <–> moles
• particles <–> mass

Homework

• Ch. 7 PAIRED (1)