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Temperature dependence 7. Using the experimental data on the right and Arrhenius equation, determine the activation energy Ea of this reaction. (R=8.3145Jmol1K1) Solution concentration and colligative property 8. Calculate the freezing point of 7.25% mass sodium phosphate (Na3PO4) aqueous solution. Water freezes at 0.00C. (R=0.08206Latmmol1K1=0.08206atmM1K1=8.3145Jmol1K1, Molar mass: Na3PO4163.94g/mol,H2O18.02g/mol, density of solution =1.01g/mL,Kf of water =1.86C/m )