Lecture_08_012712

# Lecture_08_012712 - Lecture 8 Stoichiometric Calculations Outline(Chapter 3.6-3.7 Chemical Equations(3.6 Balancing Chemical Equations(3.7

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Lecture 8: Stoichiometric Calculations • Outline (Chapter 3.6-3.7): ± Chemical Equations (3.6) ± Balancing Chemical Equations (3.7) ± Stoichiometric Calculations (3.8) ± Calculations Involving a Limiting Reactant (3.9) • Problems for Extra Practice: 3.57, 3.59, 3.65, 3.67, 3.69, 3.71

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Mass Balance (or Atom Balance) - same number of each element on each side of the equation: (1) start with largest/most complicated molecule (highest subscript values) (2) progress to other elements, leaving lone elements for last (3) make all whole numbers (4) re-check atom balance How to Balance Equations 1 C H 4 (g) + O 2 (g) 1 C O 2 (g) + H 2 O (g) 1 CH 4 (g) + 2 O 2 (g) 1 C O 2 (g) + 2 H 2 O (g) 1 C H 4 (g) + O 2 (g) 1 CO 2 (g) + 2 H 2 O (g) 1 CH 4 (g) + 2 O 2 (g) 1 CO 2 (g) + 2 H 2 O (g)
Balancing Chemical Equations The first step in the industrial preparation of nitric acid, an important chemical used in the manufacture of fertilizer, drugs and other substances, involves the reaction between ammonia (NH 3 ) and oxygen gas to form nitric oxide (NO) and water. Write a balanced equation for this reaction.

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Concept Review Balance the following equations: PCl 5 (l) + H 2 O(l) b H 3 PO 4 (aq) + HCl(g) CaO(s) + C(s) b CaC 2 (s) + CO 2 (g)
Concept Review Give the balanced equation for the following: Solid iron (III) sulfide reacts with gaseous hydrogen chloride to form solid iron(III) chloride and hydrogen sulfide gas.

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4 Fe( s ) + 3 O 2 ( g ) 2 Fe 2 O 3 ( s ) An equation can be read in “moles” by placing the words “ moles of ” between each coefficient and formula. 4 moles of
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## This note was uploaded on 02/14/2012 for the course CHEM 142 taught by Professor Zoller,williamh during the Fall '07 term at University of Washington.

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Lecture_08_012712 - Lecture 8 Stoichiometric Calculations Outline(Chapter 3.6-3.7 Chemical Equations(3.6 Balancing Chemical Equations(3.7

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