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Write the reaction rate expressions for the following reactions in terms of the disappearance of the reactants and the appearance of products:(a) $2 \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(g)$(b) $4 \mathrm{NH}_{3}(g)+5 \mathrm{O}_{2}(g) \longrightarrow 4 \mathrm{NO}(g)+6 \mathrm{H}_{2} \mathrm{O}(g)$

$$\begin{array}{l}\text { (a) }-\frac{1}{2} \frac{\left[\mathrm{H}_{2}\right]}{\Delta t}=-\frac{\left[\mathrm{O}_{2}\right]}{\Delta t}=\frac{1}{2} \frac{\left[\mathrm{H}_{2} \mathrm{O}\right]}{\Delta t} \\\text { (b) }-\frac{1}{4} \frac{\left[\mathrm{NH}_{3}\right]}{\Delta t}=-\frac{1}{5} \frac{\left[\mathrm{O}_{2}\right]}{\Delta t}=\frac{1}{4} \frac{[\mathrm{NO}]}{\Delta t}=\frac{1}{6} \frac{\left[\mathrm{H}_{2} \mathrm{O}\right]}{\Delta t}\end{array}$$

Chemistry 102

Chapter 6

Chemical Kinetics

Kinetics

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22:42

In probability theory, the conditional probability of an event A given that another event B has occurred is defined as the probability of A given B, written as P(A|B). It is a function of the probability of B, the probability of A given B, and the probability of B.

04:55

In chemistry, kinetics is the study of the rates of chemical reactions. The rate of a reaction is the change in concentration of a reactant over time. The rate of reaction is dependent on the concentration of the reactants, temperature, and the activation energy of the reaction.

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Write the reaction rate ex…

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Give the relative rates of…

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For each of the following …

04:27

So we're running the relative rate of reaction for each of these two reactions so we can figure out that our rate is, um, the change in the concentration over time, the change in time. And so we can just look at our, um, co visions and figure out how those rates are related then So we can see that for every two molecules of h two that we lose. And we also lose one molecule 02 which allows us to gain and two molecules of h two out. So if I were to write the roads a reaction, I'm just gonna use those coefficients. So the rate for age two is twice the rate, Uh 02 and it's gonna be the same, or it's also gonna be for water. It's gonna be twice the rate of 02 meaning that the rate of disappearance of H two and the rate of appearance of Ode of age too well are the same in magnitude. We can do the same thing for question be That's question and question. Be question be it's just gonna be four for the rate of disappearance of NH three five for the rate of and we can use negative here. We'd like so negative and negative to show that these are disappearing and then positive for our products because the products are being formed. This is gonna be a plus for the doctor. And, oh, over Delta T equals but six change to our times, not a team.

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