Packet 4 Page 2 lesson The mole 1

Packet 4 Page 2 lesson

The mole • 1 Mole = 6. 02 X 1023 atoms, molecules or parts • 1 mole = mass of the substance • 1 mole of any gas at STP = 22. 4 L (this is what is new)

For any gas Therefore: At STP 1 mole of any gas = 22. 4 L of the gas **this only works at STP and with gases!!

Steps • If you only have one substance and the word mole is in the problems it is 2 steps Example: 15 MOLES of hydrogen gas = ? Liters at STP

Steps • If you only have one substance and the word mole is NOT in the problem it is 3 steps Example: 15 grams of hydrogen gas = many liters at STP?

Steps If you have two different substances in the problem and an equation it is 4 steps (stoichiometry) Example: 15 grams of zinc = liters of hydrogen gas at STP?

Examples 1. 50 grams of CO 2 gas = ? Liters fill at STP? Mole is not in the problem it is 3 steps

Examples 2. 100. 2 L of CO gas = ? grams at STP

Examples Zn + HCl Zn. Cl 2 + H 2 b. 25 liters of hydrogen = ? G of Zn STP

Examples Zn + HCl Zn. Cl 2 + H 2 b. 25 grams of Zn = ? Liters of hydrogen gas at STP

PAGE 3 - CORRECTIONS • PART 2 – 1 A – 10. 5 g Ca = ? L of H 2(g) at STP – 1 B – 30. 8 L hydrogen gas = ? G of H 3 P at STP – 2 – 100 L oxygen gas = ? Grams of water at STP – PAGE 5 – IGNORE #6 LETTER A – JUST BALANCE THE EQUATION