Определите экзо- и эндотермические реакции:
а) C2H4+H2O=C2H5OH+528 кДж
б) C2H5OH=C2H4+H2O-318,2 кДж
в) C2H4+H2=C2H6+789 кДж
г) C2H6=C2H4+H2-278 кДж
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