Finding rate constant and rate of reaction

Question

Assignment:

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

Q1.) 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

Q2.)What is the value of the rate constant k? (in M^-2 min^-1)
Q3.)What would be the initial rate of reaction if [HgCl₂] = 0.020 M and [C₂O₄^2-] = 0.22 M? (in M/min)

Provide complete and step by step solution for the question and show calculations and use formulas.