Use the data given in Tables 11.1 and 11.3 to calculate the enthalpies of formation for the Group 1 fluorides and chlorides. Plot the data and comment on the trends observed.

Table 11.1.

Table 11.3.

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TABLE 11.1 Selected properties of the Group 1 elements LI 152 59(4) 519 Metallic radius/pm Ionic radius/pm (coordination number) Ionization energy/kJ mol-¹ Standard potential/V Density/g cm-³ Melting point/°C AH (M+)/(kJ mol-¹) A subH*/(kJ mol-¹) -3.04 0.53 180 -519 161 Na 186 102(6) 494 -2.71 0.97 98 -406 109 K 231 138(6) 418 -2.94 0.86 64 -322 90 Rb 244 148(6) 402 -2.92 1.53 39 -301 86 Cs 262 174(8) 376 -3.03 1.90 29 -276 79