# Question 18.10: The thermal decomposition reaction of nitrosyl halides is im...

The thermal decomposition reaction of nitrosyl halides is important in tropospheric chemistry. For example, consider the decomposition of NOCl:

$2 NOCl\left( g \right)\to 2 NO\left( g \right)+Cl_{2}\left( g \right)$

The Arrhenius parameters for this reaction are $A=1.00×10^{13} M^{-1} s^{-1}$ and $E_{a}=104.0 kJ mol^{-1}$. Calculate $\Delta H^{\ddagger }$  and $\Delta S^{\ddagger }$ for this reaction with $T=300. K$.

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Question: 18.11

## In aqueous solution at 25°C and pH 7.4 the diffusion coefficient for hemoglobin (radius =35 Å) is 7.6×10^-7 cm-² s-¹, and the diffusion coefficient for O2 (radius =2.0 Å) is 2.2 × 10^-5 cm-² s-¹ . The rate constant for the binding of O2 to hemoglobin is 4 ×10^7 M-1 s-¹. Is this a diffusion ...

Assuming the reaction is diffusion controlled, the...
Question: 18.9

## Consider the interconversion of the “boat” and “chair” conformations of cyclohexane: The reaction is first order in each direction, with an equilibrium constant of 10^4. The activation energy for the conversion of the chair conformer to the boat conformer is 42 kJ/mol. Assuming an Arrhenius ...

Using the Arrhenius expression of Equation (18.82)...
Question: 18.8

## The temperature dependence of the acid-catalyzed hydrolysis of penicillin (illustrated in Example Problem 18.7) is investigated, and the dependence of k1 on temperature is given in the following table. What is the activation energy and Arrhenius preexponential factor for this branch of the ...

A plot of $\ln\left( k_{1} \right)$ v...
Question: 18.7

## In acidic conditions, benzyl penicillin (BP) undergoes the following parallel reaction:In the molecular structures, R1 and R2 indicate alkyl substituents. Imagine swallowing penicillin while in your stomach PH is ∼3 the pH is 3. At this pH the rate constants for the processes at 22°C are k1=7.0 ...

Using Equation (18.79), \Phi_{i}=\frac{k_{i...
Question: 18.5

## Determine the time at which [I] is at a maximum for kA=2kI=0.1 s-¹. ...

This is the first example illustrated in Figure 18...
Question: 18.6

## Consider the following sequential reaction scheme:A→I→P Assuming that only reactant A is present at t=0, what is the expected time dependence of [P] using the steady-state approximation? ...

The differential rate expressions for this reactio...
Question: 18.4

## Carbon-14 is a radioactive nucleus with a half-life of 5760 years. Living matter exchanges carbon with its surroundings (for example, through CO2) so that a constant level of 14^C is maintained, corresponding to 15.3 decay events per minute. Once living matter has died, carbon contained in the ...

The ratio of decay events yields the amount of [la...
Question: 18.3

## The decomposition of N2O5 is an important process in tropospheric chemistry. The half-life for the first-order decomposition of this compound is 2.05×10^4 s . How long will it take for a sample of N2O5 to decay to 60% of its initial value? ...

Using Equation (18.29), the rate constant for the ...
Question: 18.2