(a) Estimate the value of f H(WCl 2 ) assuming it to be an ionic compound....
Question:
(a) Estimate the value of ΔfH°(WCl2) assuming it to be an ionic compound. Comment on any assumptions made. [Data needed in addition to those in Tables 21.1, 22.1 and the Appendices: ΔfH°(CrCl2) = −397 kJ mol−1].
(b) What does your answer to (a) tell you about the likelihood of WCl2 being ionic?
Table 21.1.
Table 22.1
Transcribed Image Text:
Property Atomic number, Z Physical appearance of pure metal Melting point / K Boiling point/K Ground state valence electronic configuration (core=[Ar]): Atom M+ M²+ M³+ Enthalpy of atomization, AH (298 K)/kJ mol-¹ Sc 21 1814 3104 4s²3d¹ 4s¹3d¹ 3d¹ [Ar] 378 First ionization energy, 633.1 IE₁/kJ mol™¹ Ti Second ionization energy, 1235 IE₂/kJ mol-¹ 22 V 23 Cr 24 1941 2183 2180 3560 3650 2945 3d² 3d³ 3d¹ 470 Soft; Hard; Soft; Hard; Hard; Quite soft; Hard; silver-white; lustrous ductile; blue-white lustrous malleable; brittle; tamishes in silver bright silver-blue lustrous, lustrous air coloured white white blue-white 48²3d² 4s²3d³ 4s¹3d5 4s²3d¹3d4 345 3d4 3d² 3d³ 514 397 658.8 650.9 652.9 Mn 1310 1414 1591 25 1519 2235 Fe 717.3 26 1509 1811 3023 3d6 3d5 418 Co 762.5 27 1562 4s²3d³ 48²3d 45-3d7 4s²3d8 4s¹3d³ 4s¹3d6 3d8 зая 3d³ 3d7 348 3d4 3d6 3d7 283 1768 3143 428 760.4 Ni 1648 28 1728 3005 Hard; Malleable and malleable and ductile; ductile; reddish grey-white 430 737.1 Cu 1753 29 1358 2840 4s¹3d¹⁰ 34¹⁰ 3d9 3d8 338 745.5 1958 Zn 30 Brittle at 298 K; malleable 373-423 K; lustrous blue-white 693 1180 4s²3d¹0 4s¹3d¹0 3d¹0 3d⁹ 130 906.4 1733
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