Consider the following decomposition reaction that takes place in a sealed 2 dm³ container: $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ The graph below shows how the concentrations of $N_2O_5(g)$ and $NO_2(g)$ change with time. **Concentration-time graph** Refer to the graph above and give a reason why curve A represents the change in the concentration of $NO_2(g)$. Consider the statement below: The rate of decomposition of $N_2O_5(g)$ is half the rate of formation of $NO_2(g)$. Is this statement TRUE or FALSE? Give a reason for the answer.

NSC Physical Sciences Rate and Extent of Reactions: Consider the following decomposi

Consider the following decomposition reaction that takes place in a sealed 2 dm³ container: $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ The graph below shows how the concentrations of $N_2O_5(g)$ and $NO_2(g)$ change with time - NSC Physical Sciences - Question 5 - 2023 - Paper 2

Question 5

$Consider-the-following-decomposition-reaction-that-takes-place-in-a-sealed-2-dm³-container:--$$2N_2O_5(g)-\rightarrow-4NO_2(g)-+-O_2(g)$$--The-graph-below-shows-how-the-concentrations-of-$N_2O_5(g)$-and-$NO_2(g)$-change-with-time-NSC Physical Sciences-Question 5-2023-Paper 2.png$

Consider the following decomposition reaction that takes place in a sealed 2 dm³ container: $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ The graph below shows how ... show full transcript

Worked Solution & Example Answer:Consider the following decomposition reaction that takes place in a sealed 2 dm³ container: $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ The graph below shows how the concentrations of $N_2O_5(g)$ and $NO_2(g)$ change with time - NSC Physical Sciences - Question 5 - 2023 - Paper 2

Step 1

Refer to the graph above and give a reason why curve A represents the change in the concentration of NO2(g).

96%

114 rated

Answer

Curve A represents the concentration of $NO_2(g)$ because it shows an increasing trend over time. As the decomposition of $N_2O_5(g)$ occurs, $NO_2(g)$ is produced, leading to an increase in its concentration. This correlates with the stoichiometry of the reaction, where 4 moles of $NO_2(g)$ are formed for every 2 moles of $N_2O_5(g)$ that decompose.

Step 2

Is this statement TRUE or FALSE? Give a reason for the answer.

99%

104 rated

Answer

This statement is TRUE. According to the reaction stoichiometry, the rate of decomposition of $N_2O_5(g)$ is indeed half the rate of formation of $NO_2(g)$ . This is expressed mathematically as:

$\text{Rate of decomposition of } N_2O_5 = \frac{1}{2} \times \text{Rate of formation of } NO_2$

Given that the production of $NO_2(g)$ occurs at a rate proportional to its stoichiometric coefficient (4 moles), while $N_2O_5(g)$ decomposes at a rate corresponding to its stoichiometric coefficient (2 moles), the relationship confirms the statement.

Consider the following decomposition reaction that takes place in a sealed 2 dm³ container: $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ The graph below shows how the concentrations of $N_2O_5(g)$ and $NO_2(g)$ change with time - NSC Physical Sciences - Question 5 - 2023 - Paper 2

Refer to the graph above and give a reason why curve A represents the change in the concentration of NO2(g).

Is this statement TRUE or FALSE? Give a reason for the answer.

Join the NSC students using SimpleStudy...