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Whatmassofoxygenwill

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Unformatted text preview: and products in a balanced chemical equation. · A balanced chemical equat ion provides several important informat ion about the reactants and products in a chemical reaction. For example: 1N2(g) + 3 H2(g) 2 NH3(g) 1 molecule 3 molecules 100 molecules 300 molecules 1 million molecules 3 million molecules 1 mole N2 + 2 molecules 200 molecules 2 million molecules 3 moles H2 2 moles NH3 This is the MOLE RATIO between REACTANTS and PRODUCTS Summary of Stoichiometric Calculations in Chemistry Examples: 1. Determine each mo le ration based on the reaction shown below: 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O a) mol O 2 = mol CO 2 b) 20 mol C 4 H 0 1 = mol H 2 O Chemistry 51 Chapter 6 STOICHIOMETRIC CALCULATIONS Mole­Mole Calculations: · Relates moles of reactants and products in a balanced chemical equat ion Examples: 1. How many mo les of nitrogen will react with 2.4 moles of hydrogen to produce ammo nia as shown in the reaction below? 1 N2(g) + 3 H2(g) 2 NH3(g) 1 mo l N2 2.4 mo l H2 x ¾¾¾¾ = 0.80 mol N2 3 mo l H2 Mole Ratio 2. How many mo les of ammo nia can be produced from 32 mo les of hydrogen? (Assume excess nitrogen present) 32 mo l H2 x ¾¾¾¾¾ = mo l NH3 3. In one experiment, 6.80 mol o f ammo nia are prepared. How many mo les of hydrogen were used up in this experiment? 21 Chemistry 51 Chapter 6 STOICHIOMETRIC CALCULATIONS Mass­Mole Calculations: · Relates moles and mass of reactants or products in a balanced chemical equation Examples: 1. How many grams o f ammo nia can be produced from the react ion of 1.8 mo les of nitrogen with excess hydrogen as shown below? 1 N2(g) + 3 H2(g) 2 NH3(g) 2 mo l NH3 17.0 g NH3 1.8 mo l N2 x ¾¾¾¾¾ x ¾¾¾¾¾ = 61 g NH3 1 mo l N2 1 mo l NH3 Mole Ratio Molar Mass 2. How many mo les of hydrogen gas are required to produce 75.0 g of ammo nia? 75.0 g NH3 x ¾¾¾¾¾¾¾ x ¾¾¾¾¾¾¾ = mol H2 3. How many mo les of ammo nia can be produced from the react ion of 125 g of nitrogen as shown above? 22 Chemistry 51 Chapter 6 STOICHIOMETRIC CALCULATIONS Mass...
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This document was uploaded on 03/18/2014 for the course CHEM 51 at Los Angeles Mission College.

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