224- Reaction rate: $\mathrm{NO_2(g) + CO(g) \to NO(g) + CO_2(g)}$, follows the relation $\bar{R} = k[\mathrm{NO_2}]^2$. Which graph about the progress of the reaction is correct? (Initial concentration of reactants is one mole per liter.) [Figure: Four graphs showing $\bar{R}/k$ vs. $t$. Graph (1): decreasing curve starting at 1. Graph (2): decreasing straight line starting at 1. Graph (3): decreasing curve starting above 1. Graph (4): decreasing curve starting at 1 with different curvature.]
\textbf{224-} Reaction rate: $\mathrm{NO_2(g) + CO(g) \to NO(g) + CO_2(g)}$, follows the relation $\bar{R} = k[\mathrm{NO_2}]^2$. Which graph about the progress of the reaction is correct? (Initial concentration of reactants is one mole per liter.)
\textit{[Figure: Four graphs showing $\bar{R}/k$ vs. $t$. Graph (1): decreasing curve starting at 1. Graph (2): decreasing straight line starting at 1. Graph (3): decreasing curve starting above 1. Graph (4): decreasing curve starting at 1 with different curvature.]}
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