Consider the following reaction between mercury(II) chloride and oxalate ion:

2HgCl2(aq)+C2O2−4(aq)→2Cl−(aq)+2C O2(g)+Hg2Cl2(s)

The initial rate of this reaction was determined for several concentrations of HgCl2 and C2O2−4, and the following rate data were obtained for the rate of disappearance of C2O2−4:

Experiment HgCl2(M) C2O2−4(M) Rate (M/s)

1 0.164 0.15 3.2×10−5

2 0.164 0.45 2.9×10−4

3 0.082 0.45 1.4×10−4

4 0.246 0.15 4.8×10−5

What is the value of the rate constant with proper units?

What is the reaction rate when the concentration of HgCl2 is 0.150 M and that of C2O2−4 is 0.50 M , if the temperature is the same as that used to obtain the data shown?