The balanced equation for the reaction of hydrazine with oxygen is to be stated. The value of Δ H ° for this reaction is to be calculated using the bond energies from Table 3-3 . Concept introduction: The expression to calculate the value of Δ H ° is, Δ H ° = ∑ n p D ° ( bonds broken ) − ∑ n r D ° ( bonds formed ) To determine: The balanced equation for the reaction of hydrazine with oxygen; the value of Δ H ° for this reaction is to be calculated using the bond energies from Table 3-3 .

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Lewis Structure, Hybridization & Molecular Geometry a) Draw the Lewis Structure of the molecules; Label the hybridization of each carbon atom; Predict the approximate molecular geometry around each carbon atom. CH3CHO CH3CN b) Draw the Lewis Structure of Nitromethane; Predict the approximate molecular geometry around the nitrogen atom. CH3NO2 c) Draw the Lewis Structure; Label the hybridization of the boron atom; Predict the approximate molecular geometry. BF3 BF4

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Chapter 20, Problem 79AE

Interpretation Introduction

Interpretation: The balanced equation for the reaction of hydrazine with oxygen is to be stated. The value of ΔH° for this reaction is to be calculated using the bond energies from Table 3-3 .

Concept introduction: The expression to calculate the value of ΔH° is,

ΔH°=∑npD°(bonds broken)−∑nrD°(bonds formed)

To determine: The balanced equation for the reaction of hydrazine with oxygen; the value of ΔH° for this reaction is to be calculated using the bond energies from Table 3-3 .

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