1. Warm Up 5.5: Determine all possible Mole Ratio’s from last class’s warm up 1.2NH 3 + H 2 SO 4  (NH 4 ) 2 SO 4 2.4 C 5 H 9 O + 27 O 2  20 CO 2 + 18 H 2 O

2. Warm Up 5.5: Determine Mole Ratio 1.2NH 3 + H 2 SO 4  (NH 4 ) 2 SO 4 2.4 C 5 H 9 O + 27 O 2  20 CO 2 + 18 H 2 O

3. Steps for Reaction Stoichiometry ( back of mole map) Step 1: Write the # from the problem Step 2: What are you looking for ?

4. Steps for Reaction Stoichiometry Step 3: What you need: A. Mole Ratio : from the Balanced chemical reaction Coefficients B. Start unit  mole: conversion needed C. mole  desired unit: conversion needed

5. Conversions:  1 mole = 22.4 Liters  1 mole = # grams ( Molar Mass)  1 mole = 6.02 x 10 23 representative particles (atom, molecule, or formula unit )

6. Step 4: Set- Up

7. Ex. 2 How many moles of sodium will react with water to produce 4.0 mol of hydrogen in the following reaction? 2Na(s) + 2H 2 O(l)  2NaOH(aq) + H 2 (g) # from problem: Looking for: ? Mole ratio: Conversion start unit  mole: Conversion mole  desired unit:

8. Ex. 3 When sulfur dioxide reacts with oxygen at STP, how many molecules of oxygen are needed to produce 19.8L of sulfur trioxide? 2SO 2 + O 2  2SO 3 # from problem: Looking for: ? Mole ratio: Conversion start unit  mole: Conversion mole  desired unit:

9. Ex. 4 The following reaction shows the synthesis of zinc citrate, a ingredient in toothpaste, from zinc carbonate and citric acid. 3ZnCO 3 (s) + 2HC 6 H 7 O 7 (aq)  Zn 3 (C 6 H 5 O 7 ) 2 (aq) + 3H 2 O(l) + 3CO 2 (g) How many liters of CO 2 are produced from 23grams of citric acid(HC 6 H 7 O 7 )? # from problem: Looking for: ? Mole ratio: Conversion start unit  mole: Conversion mole  desired unit:

10. Cool Down: Calculate the formula units of silver bromide produced from 22.5 g of silver nitrate in the following reaction: ( 7.97x 10 22 formula units AgBr) 2AgNO 3 (aq) + MgBr 2 (aq)  2AgBr(s) + Mg(NO 3 ) 2 (aq) Given: Looking for? Conversions