11.试计算在298.2K时由环丙烷(g)异构化制丙烯(g)反应的 (Delta )_(r)(H)_(m)(298.2k) 已知各物质-|||-在298.2K的热力学数据如下表所示:-|||-物质 △._(m)^g(298.2k)/(kJcdot mo(l)^-1) (Delta )_(k)(H)_(m)(298.2k)/(kJcdot mo(l)^-4)-|||-H2(g) -285.84 0-|||-C(石墨) -393.51 0-|||-C3H6(环丙烷,g) -2091.68-|||-C3H6(丙烯,g) 20.40