Wake-up Al + H 2 SO 4  Al 2 (SO 4 ) 3 + H 2 1.Balance the equation above. 1.How many grams of H 2 SO 4 will react with 18g of Al?

STOICHIOMETRY What does volume have to do with stoichiometry?

Stoichiometry Problem Inventory How many moles of Ammonia could I make from 3 moles of Nitrogen? _____ N 2 (g) + _____H 2 (g)  ______ NH 3 (g) 132 Given: 3 mol N 2 mol N 2 mol NH mol NH 3 = Mole to Mole Problems Given = Moles Unknown = Moles

Stoichiometry Problem Inventory How many grams of Ammonia will be produced from 3 grams of Nitrogen? _____ N 2 (g) + _____H 2 (g)  ______ NH 3 (g) 132 Given:3g N 2 g N 2 mol NH g NH 3 = Mass and Moles Problems Given = Mass Unknown = Mass Mass to Mass/Moles Problems Given = Mass Unknown = Moles Mass to Mass/Moles Problems Given = Moles Unknown = Mass mol N mol NH 3 g NH 3 16

Converting Mass to Mass Problems Use Road Map Provided Follow Directions – like following a recipe!

STP Standard Temperature and Pressure The standard temperature is 273 K (0° Celsius) and the standard pressure is 1 atm (atmosphere) pressure.

STP and Moles At STP, one mole of gas occupies 22.4 L of volume.

Conversion Factor for Volume at STP and Moles

Example #1 _____ N 2 (g) + _____H 2 (g)  ______ NH 3 (g) 132 Given:25g N 2 g N 2 mol NH L NH 3 = Mass to Volume mol N mol NH 3 L NH What volume of NH 3 at STP is produced if 25g of N 2 is reacted with an excess of H 2 ?

Example #2: What volume of hydrogen at STP is produced when 2.5g of zinc react with an excess of hydrochloric acid? ___ Zn + ___ HCl  ___ ZnCl 2 + ___ H Circle the known. Box what you are trying to find. 2.5 g Zn g Zn mol Zn mol Zn mol H L H = 0.85 L H 2 1