4.
用\(\rm{H_{2}O_{2}}\)和\(\rm{H_{2}SO_{4}}\)的混合溶液可溶出废旧印刷电路板上的铜。已知:
\(\rm{Cu(s)+2H^{+}(aq)=Cu^{2+}(aq)+H_{2}(g)}\) \(\rm{ΔH=+64.39kJ·mol^{-1}}\)
\(\rm{2H_{2}O_{2}(l)=2H_{2}O(l)+O_{2}(g)}\) \(\rm{ΔH=-196.46kJ·mol^{-1}}\)
\(\rm{{{{H}}_{{2}}}{(g})+\dfrac{1}{2}{{{O}}_{2}}{(g})={{{H}}_{{2}}}{O(l})}\) \(\rm{ΔH=-285.84kJ·mol^{-1}}\)
在\(\rm{H_{2}SO_{4}}\)溶液中,等物质的量为\(\rm{Cu}\)与\(\rm{H_{2}O_{2}}\)反应生成\(\rm{Cu^{2+}(aq)}\)和\(\rm{H_{2}O(l)}\)的反应热的\(\rm{ΔH}\)等于