Determine the heat of reaction (ΔHrxn) for the process by which lead (II) chloride (PbCl2) is formed from its elements:
Pb (s) + Cl2 (g) → PbCl2 (s)
by using the following thermochemical data:
Pb (s) + 2 Cl2 (g) → PbCl4 (l) ΔH = - 329.3 kJ
PbCl2 (s) + Cl2 (g) → PbCl4 (l) ΔH = + 30.1 kJ
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