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rate constant and rate of reaction

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The rate of the following reaction in aqueous solution is monitored by measuring the number of moles of Hg2Cl2 that precipitate per liter per minute. The data obtained are listed in the table.
2HgCl2 + (C2O4^2-) ----> (2Cl^-) + 2CO2 (g) + Hg2Cl2 (s)
Experiment [HgCl2],M ([C2O4]^2-),M Initial rate,mol L^-1min-1
1 0.105 0.15 1.8 x 10^-5
2 0.105 0.30 7.1 x 10^-5
3 0.052 0.30 3.5 x 10^-5
4 0.052 0.15 8.9 x 10^-6

1.) Determine the order of the reaction with respect to HgCl2, with respect to (C2O4^2-) and overall:

HgCl2
(a)first
(b)second
(c)third

(C2O4^2-)
(a)first
(b)second
(c)third

overall order of reaction:
(a)first
(b)second
(c)third

2.)What is the value of the rate constant k? (in M^-2 min^-1)
3.)What would be the initial rate of reaction if [HgCl2] = 0.020 M and [C2O4^2-] = 0.22 M? (in M/min)

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It detemines the rate constant, rate of reaction, and the order of the reaction. The solution is detailed and has a '5/5' rating.

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Rate Laws, Rate Constants and Reaction Orders

Please see the attached file for the fully formatted problems.

Question 1
Consider the reaction

whose rate at 25 was measured using three different sets of initial concentrations as listed in the following table:

1 0.40 0.010 1.9×10^3
2 0.40 0.020 3.8×10^3
3 0.80 0.010 7.7×10^3

What is the rate law for this reaction?
Express the rate law symbolically.

Question 2
In a study of the decomposition of hydrogen iodide

the following concentration-time data were collected:
Time

0 0.467
1 0.267
2 0.187
3 0.144
4 0.117
5 0.099
6 0.085
7 0.075

What is the order of the reaction?

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