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?

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet