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General Chemistry Week Five Notes

by: Nina Drachman

General Chemistry Week Five Notes CHEM103090

Marketplace > University of Delaware > Health and Human Services > CHEM103090 > General Chemistry Week Five Notes
Nina Drachman
General Chemistry
Graves PhD,Kimberly Susan

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Chapter 4: Stoichiometry Applications
General Chemistry
Graves PhD,Kimberly Susan
Class Notes
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This 2 page Class Notes was uploaded by Nina Drachman on Tuesday October 6, 2015. The Class Notes belongs to CHEM103090 at University of Delaware taught by Graves PhD,Kimberly Susan in Fall 2015. Since its upload, it has received 56 views. For similar materials see General Chemistry in Health and Human Services at University of Delaware.


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Date Created: 10/06/15
Chemistry Lecture Sep 29 Chapter 4 Stoichiometry Applications Focus Question Making Ammonia The Haber process converts N2 and H2 into NH3 D now used to make primary components of fertilizers In 2010 131000000000 kg ammonia produced world wide This equates to nearly 20 kghumanyear about 45 lbs How much nitrogen and hydrogen are needed to make enough ammonia for one person Balancing Chemical Equations Balanced chemical equations follow the Law of Conservation of Matter 0 Every atom of a certain element at the beginning of the reaction needs to appear at the end of the reaction Coef cients represent molar amounts must be whole numbers CH4g NH3g HCNg 3H2g Balancing Combustion Reactions CH4g 202g n 2H20g C02g Production of Ammonia How many kilograms of N2 and H2 are required to produce 200 kg of NH3 Concepts of Stoichiometry 3 MgSO4 2Na2PO4 D Mg3PO42 3Na2504 lfl had 27 grams of MgSO4 and I wanted to know how many moles of Mg3PO42 would be produced what do I need to do before I can use the molar proportions in the chemical equation 0 Find the molar mass of Na2PO4 0 Know how many moles of Na2O4 l have 0 Find how many moles of MgSO4 are in 27 grams 0 Use 1 mole is equal to 602 X 10quot23 Production of Ammonia How many kilograms of N2 and H2 are required to produce 200 kg of NH3 To solve O O O O 0 Write and balance chemical equation Convert kg NH3 to moles Calculate moles of N2 and H2 needed using mole ratios Convert moles of N2 and H2 needed using mole ratios Convert moles of N2 and H2 needed to kg Production of Ammonia Balance the equation 0 N2g H2g D NH3g Convert 200 kg NH3 to moles NH3 Solve for kg of N2 and H2 using mole ratios and molar masses What mass of hydrogen gas in kg is needed to make 200 kg of ammonia Reviewing the Haber Process Perhuman yearly totals N2g 3H2g D 2NH3g Given these amounts of reactants actual mass of NH3 produced at 440 degrees celcius and 200 atm is only 8kg 0 Why 0 What does this mean for N2 and H2 actually used Theoretical and Actual Yield Theoretical yield amount of product that would result if reagents fully reacted Actual yield amount of product actually obtained from a reaction some of each reactant is left over


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