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In 15.3, the entire rate law for the reactant should have a negative sign in front of it. However, because we find the change in concentration as final-initial, 320mmol-450mmol=-130mmol. When fully written out, rate=∆concentration/∆t=-(320mmol-450mmol)/20s=+6.5x10^-3. The negative signs cancel out to generate a positive rate overall.
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