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Diatomic Elements • There are 7 elements that naturally come in pairs (2) instead of by themselves due to stability. • Ex. N2 or Cl2 BrINClHOF 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 = 6.022x1023 Particles (atoms 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 3.3x1023 molecules of N2I6? 2 Step Mole Conversions 1. How many iron atoms are in a 2.75g sample? 2. A container of what volume is required to hold 12g 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 8.4x1026 particles? Chemistry January 15th Pick Up Warm Up •What Turn In •Mini Mole Lab •Conversions #2 is the percent composition of aluminum in Al2(CrO4)3? •What volume of methane (CH4) gas at STP is occupied by 5.5 grams?