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3. (3 point) Justify, based on its nature and intermolecular forces, the boiling points of the following two series of substances: Substance: Tb (°C): Substance: Tb (°C): HF HCl HBr HI 19.5 -84.9 -67 -33.3 CO2 NO2 SO2 ClO2 -78.5 21.2 -10 9.9 Part B_ Solve the following Problems (specify the full procedure in a clean and clear way): 4. (3 point) A 10% (w/w) aqueous solution of urea CO(NH2)2 with a density=1.02g/cm3 is kept at 20°C. Calculate molarity, molality and molar fraction for urea and water. 5. (3 point) The aqueous solution with which of the following concentrations of solute will have the lowest melting/freezing point? a) 2g of Ca(NO3)2 in 750mL of H2O b) 0.12 m KBr c) 0.10m NH4NO3 9. (3 point) At 30 °C, for the following reaction we experimentally obtained the following data: Experiment Initial concentration (M) 1 2 3 [A] [B] 4x10-2 4x10-2 4x10-2 8x10-2 1.20x10-1 8x10-2 Rate (M/s) 4.0 8.0 24.0 a) Calculate the order of this reaction for A and B and the overall order of the reaction. (2points) b) Write the rate law for this reaction and calculate k (be sure to include the correct units). (2 points)

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