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 .

Question

Consider the following Figure 2 and two atoms that are initially an infinite distance apart, x =00, at which point the potential energy of the system is U = 0. If they are brought together to x = x, the potential energy is related to the total force P by dU dx = P Given this, qualitatively sketch the variation of U with x. What happens at x=x? What is the significance of x = x, in terms of the potential energy? 0 P, Force 19 Attraction Total Repulsion x, Distance Figure 2. Variation with distance of the attractive, repulsive, and total forces between atoms. The slope dP/dx at the equilibrium spacing xe is proportional to the elastic modulus E; the stress σb, corresponding to the peak in total force, is the theoretical cohesive strength.

Answer 1

Question

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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