11. In which of the following delta H =delta U? (1) N2(g)+3H2(g)---> 2NH3(g) (2) c(s)+o2(g)->>CO2(g) (3)Pcl5(g)->>Pcl3(g)+cl2(g) (4)CaCO3(s)->>CaO(s)+CO2(g)

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