Calculating delta h for the reaction

Question

Assignment:

Question 1. Calculate deltaH for the reaction P₄O₁₀ + 6 PCl₃ ----? 10 Cl₃PO

From
P₄ + 6 Cl₂ -----> 4 PCl₃ deltaH = -1225.6 kJ
P₄ + 5 O₂ -----> P4O₁₀ deltaH = -2967.3 kJ
PCl₃ + Cl₂ -----> PCl₅ deltaH = -84.2 kJ
PCl₃ + ½ O₂ ---> Cl₃PO deltaH = -285.7 kJ

Question 2. Experiment

................[HgCl₂]M............ [C₂O₄^-2]M........ Rate(M/sec)
1..................0.105....................0.15...............1.8 x 10-5
2 .................0.105....................0.30...............7.2 x 10-5
3...................0.052...................0.30...............3.5 x 10-5
4..................0.052....................0.15...............8.9 x 10-6
5 .................0.200....................0.45.....................X
6..................0.35..........................y.................5.0 x 10-5

a) Determine the rate law
b) Calculate k
c) Determine the values for X and Y
3. Butadiene, C₄H₆, dimerizes to C₈H₁₂ with a 1st order rate constant of 0.014 L/mol sec. Starting with 0.025 M
a) What will be the concentration after 3.00 minutes?
b) How long will it take the concentration to drop to 0.0065 M?

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