Given the standard enthalpy changes for the following two reactions:
(1) 2Pb(s) + O2(g)2PbO(s)…… ?H� = -434.6 kJ
(2) Pb(s) + Cl2(g)PbCl2(s)……?H� = -359.4 kJ
what is the standard enthalpy change for the reaction:
(3) 2PbCl2(s) + O2(g)2PbO(s) + 2Cl2(g)……?H� = ?
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