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4 of 7 IV Fill( a ) to (d) in the sentences below with appropriate values. Calculate the values to three significant figures for ( a ), b), and (d). Use the following value if necessary; √3-1.73. (1) The dissociation energies of H₂ and O₂ are 436 kJ mol¹ and 498 kJ mol¹, respectively, and the bond energy of O-H bond is 463 kJ mol. The heat of vaporization for water (liquid) is 44.0 kJ mol¹. Therefore, the heat of formation for water (liquid) is ( a ) kJ mol¹. Furthermore, hydrogen reacts with oxygen to form gaseous hydrogen peroxide as follows: H₂ + O₂ → H₂O₂ In the above reaction, 142 kJ mol¹ is released as heat. Hence, the bond energy of 0-0 bond in the hydrogen peroxide molecule is ( b ) kJ mol¹¹. (2) In ionic crystals with 1:1 ratio of cations and anions, there are two representative types of crystal structure, NaCl and CsCl types. In NaCl crystals, the number of nearest-neighboring Cl ions surrounding one Na ion is 6. On the other hand, in CSCI crystals, the number of nearest- neighboring CT ions surrounding one Cs' ion is (c). The ionic radius of CI ion is 0.167 nm, and the edge length of a cubic unit cell of CSCI is 0.412 nm. Therefore, the ionic radius of Cs ion is (d ) nm.