Diatomic Elements There are 7 elements that naturally

Diatomic Elements • There are 7 elements that naturally come in pairs (2) instead of by themselves due to stability. • Ex. N 2 or Cl 2 Br. INCl. HOF

Got it? (CFU) • What is the molar mass of chlorine? • What is the molar mass of carbon? • What is the molar mass of oxygen? • What is the molar mass of aluminum?

Mole Conversions 1 Mole = 6. 022 x 1023(atoms Particles or molecules) 1 Mole = Molar Mass Grams 1 Mole = 22. 4 L (of gas @ STP)

Why does 1 Mole = 22. 4 L? Avogadro’s law states that 1 mole of any gas will occupy the same volume as 1 mole of any other gas at the same temperature and pressure. At STP, that volume is 22. 4 L.

Back to Mole Conversions! 1. How many atoms are in a 0. 250 mole sample of the element silver? 2. How many moles are equal to 100. 0 grams of carbon tetrachloride? 3. What volume of carbon dioxide gas at STP is required to have 74. 6 moles of gas? 4. What mass would 9. 8 moles of bromine gas have? 5. How many moles is 3. 3 x 1023 molecules of N 2 I 6?

2 Step Mole Conversions 1. How many iron atoms are in a 2. 75 g sample? 2. A container of what volume is required to hold 12 g of chlorine gas at STP? 3. How many carbon dioxide molecules could be held in an empty 2. 0 L bottle at STP? 4. What mass of calcium nitrate is equal to 8. 4 x 1026 particles?

Chemistry January 15 th Pick Up Warm Up • What Turn In • Mini Mole Lab • Conversions #2 is the percent composition of aluminum in Al 2(Cr. O 4)3? • What volume of methane (CH 4) gas at STP is occupied by 5. 5 grams?