Q.

For the chemical reaction between mercuric chloride and potassium oxalate, the mass of Hg2Cl2 precipitated in different time intervals at 100oC is given below

Exp. no[HgCl2]0 (M)[K2C2O4]0 (M)Time (Min)Hg2Cl2 formed (g)
10.08360.404650.0068
20.08360.2021200.0031
30.04180.404600.0032

What is the rate law expression of this reaction?

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a

r = K[HgCl2]2[K2C2O4]2

b

r = K[HgCl2][K2C2O4]2

c

r = K[HgCl2][K2C2O4]

d

r = K[HgCl2]2[K2C2O4]

answer is D.

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Detailed Solution

r1 = 0.0068 / 65 = 1.046 x 10-4 gm / min 
r2 = 0.0031 / 120 = 2.583 x 10-5gm / min 
r3 = 0.0032 / 60 = 5.333 x 10-5 gm / min 
From (1) and (2): order with respect to K2C2O2 = 2
From (1) and (2): order with respect to HgCl2 = 1

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