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（10广安4）．（5分）人体缺乏维生素C（简写“Vc”）会患坏血病。右图所示为某种“维生素C”说明书的一部分，请回答： （1）“Vc”属于________________化合物（填“无机”或“有机”）； （2）“Vc”中C、H、O三种元素的质量比是________________； （3）若正常成人每天对“Vc”的最低需要量为60mg： ①当这些“Vc”完全来自右图的“维生素C”时，则每次服用“维生素C”至少_______片； ②当这些“Vc”完全来自某种新鲜蔬菜（每1000g这种蔬菜含“Vc”120mg）时，每天至少应食用这种蔬菜___________g； （4）取2片“维生素C”溶于水，滴入紫色石蕊试液变红色，说明“Vc”溶液的PH_______7（选填“>”、“
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