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Lecture19, 2-25-08 Integrated rate laws

# Lecture19, 2-25-08 Integrated rate laws - Determining Rate...

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Determining Rate Laws Initial Rates Method-Differential Rates 1. Find two experiments in which all but one reactant’s concentration is constant. 2. Observe the relationship between concentration change and rate change of that reactant. 3. Repeat for other reactant(s).

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NH 4 + (aq) + NO 2 ¯(aq) N 2 (g) + 2 H 2 O(l) 5.40 x 10 -7 0.0100 0.200 3 2.70 x 10 -7 0.0100 0.100 2 1.35 x 10 -7 0.0050 0.100 1 Initial Rate (M·s -1 ) [NO 2 ¯] o [NH 4 + ] o Exp. # Determine the rate law Rate = k[NH 4 + ][NO 2 - ] Practice Problem – Determine the value of the rate constant.
2 NO(g) + Cl 2 (g) 2 NOCl(g) 1.45 0.20 0.20 3 0.36 0.20 0.10 2 0.18 0.10 0.10 1 Initial Rate (M·min -1 ) [Cl 2 ] o [NO] o Exp. # Practice – Determine rate law and rate constant

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BrO 3 ¯(aq) + 5 Br¯(aq) + 6 H + (aq) 3 Br 2 (l) + 3 H 2 O(l) 3.2 x 10 -3 0.20 0.10 0.10 4 0.20 0.10 0.10 [Br¯] o 3.2 x 10 -3 0.10 0.20 3 1.6 x 10 -3 0.10 0.20 2 8.0 x 10 -4 0.10 0.10 1 Initial Rate (M·s -1 ) [H + ] o [BrO 3 ¯] o Exp. # Practice- Determine rate law and rate constant