For the chemical reaction between mercuric chloride and potassium oxalate, the mass of Hg2Cl2 precipitated in different time intervals, at 100°C, is given below: (table with [HgCl2], [K2C2O4], Time, H

Question

For the chemical reaction between mercuric chloride and potassium oxalate, the mass of Hg2Cl2 precipitated in different time intervals, at 100°C, is given below: (table with [HgCl2], [K2C2O4], Time, Hg2Cl2 formed). What is the rate law expression of this reaction?

Prashant Kotian · Accepted Answer

Correct answer: D. Calculating rate ≈ mass/time. Exp 1: 0.0068/65 ≈ 1.04×10^-4. Exp 2: 0.0031/120 ≈ 2.58×10^-5. Exp 3: 0.0032/60 ≈ 5.33×10^-5. Comparing Exp 1 & 2: K2C2O4 doubles, rate quadruples (order 2). Comparing Exp 1 & 3: HgCl2 doubles, rate doubles (order 1). Rate = K[HgCl2][K2C2O4]^2. Therefore, correct answer is D.

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