Lec-28-Chap-04-1

# Lec-28-Chap-04-1 - Reaction of hydrogen gas with oxygen gas...

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CHE 131 Lecture 28 – Chemical Equations Chapter 4: pp. 124-136. no reaction NR + oxygen gas + O 2 (g) hydrogen gas H 2 (g) Add 1 volume O 2 Add 1 volume H 2 Tube of water No reaction Reaction of hydrogen gas with oxygen gas: hydrogen gas + oxygen gas water H 2 (g) + O 2 (g) H 2 O(l) + ½ O 2 (g) Add 1 volume H 2 Add 1 volume O 2 Add spark Get H 2 O + ½ volume O 2 Tube of water Reaction of hydrogen gas with oxygen gas: spark spark Add spark Get H 2 O water H 2 O Add 1 volume O 2 + oxygen gas + O 2 (g) Tube of water Reaction of hydrogen gas with oxygen gas: Add 2 volumes H 2 hydrogen gas H 2 (g) spark spark

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Using Avogadro’s law (n = kV) Case 1: All the hydrogen reacts, ½ the oxygen is unreacted 2 H 2 + 2 O 2 2 H 2 O + O 2 Case 2: All the hydrogen and oxygen react 2 H 2 + O 2 2 H 2 O • Unbalanced: H 2 (g) + O 2 (g) H 2 O(l) Balanced, Detailed: 2 H 2 (g) + 2 O 2 (g) 2 H 2 O(l) + O 2 (g) reactants products Stoichiometric coefficients give the number of molecules or moles of each species involved in the reaction.
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