Exercises: Reaction rate and how to measure it
Practice★☆☆
Hydrogen peroxide (the antiseptic known in Mexico as agua oxigenada) decomposes according to $2\ \text{H}2\text{O}2 \rightarrow 2\ \text{H}2\text{O} + \text{O}2$. In an…
Hydrogen peroxide (the antiseptic known in Mexico as agua oxigenada) decomposes according to $2\ \text{H}_2\text{O}_2 \rightarrow 2\ \text{H}_2\text{O} + \text{O}_2$. In an experiment its concentration drops from $0.80\ \text{mol}/\text{L}$ to $0.50\ \text{mol}/\text{L}$ in $60\ \text{s}$. Calculate the average rate of disappearance of hydrogen peroxide over that interval, including the units.
Practice★★☆
In the decomposition of dinitrogen pentoxide, $2\ \text{N}2\text{O}5 \rightarrow 4\ \text{NO}2 + \text{O}2$, the concentrations shown in the table were measured. | $t$…
In the decomposition of dinitrogen pentoxide, $2\ \text{N}_2\text{O}_5 \rightarrow 4\ \text{NO}_2 + \text{O}_2$, the concentrations shown in the table were measured.
| $t$ (s) | $[\text{N}_2\text{O}_5]$ (mol/L) |
|---|---|
| 0 | 0.90 |
| 100 | 0.60 |
| 200 | 0.40 |
| 300 | 0.27 |
- a) Calculate the average rate of disappearance of $\text{N}_2\text{O}_5$ over the intervals from $0$ to $100\ \text{s}$ and from $200$ to $300\ \text{s}$. b) Explain why the rate is different in the two intervals.