219 -- If 1 mol of $\mathrm{KClO_4}$ is heated in the presence of a catalyst in a 5-liter flask, at a constant rate of $0.1\ \mathrm{mol \cdot s^{-1}}$, according to the reaction: $2\mathrm{KCl(s)} + 3\mathrm{O_2(g)} \rightarrow 2\mathrm{KClO_3(s)}$, the reaction is decomposed; after a few seconds the reaction is complete and the graph of molar concentration changes of $\mathrm{O_2}$ versus time is shown. Which of the following is correct?
[Figure: Four graphs (1)--(4) showing concentration (mol$\cdot$L$^{-1}$) of $\mathrm{O_2}$ vs. $t$(s), with axes labeled up to 0.3 on y-axis and 5, 10, 15 on x-axis. Options (1) and (2) show linearly increasing then constant graphs reaching 0.15; options (3) and (4) show linearly increasing then constant graphs reaching 0.05.]
\textbf{219 --} If 1 mol of $\mathrm{KClO_4}$ is heated in the presence of a catalyst in a 5-liter flask, at a constant rate of $0.1\ \mathrm{mol \cdot s^{-1}}$, according to the reaction: $2\mathrm{KCl(s)} + 3\mathrm{O_2(g)} \rightarrow 2\mathrm{KClO_3(s)}$, the reaction is decomposed; after a few seconds the reaction is complete and the graph of molar concentration changes of $\mathrm{O_2}$ versus time is shown. Which of the following is correct?
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\textit{[Figure: Four graphs (1)--(4) showing concentration (mol$\cdot$L$^{-1}$) of $\mathrm{O_2}$ vs. $t$(s), with axes labeled up to 0.3 on y-axis and 5, 10, 15 on x-axis. Options (1) and (2) show linearly increasing then constant graphs reaching 0.15; options (3) and (4) show linearly increasing then constant graphs reaching 0.05.]}
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