防腐剂山梨酸钾的化学式为C6H7KO2,试回答: (1)山梨酸钾由    

防腐剂山梨酸钾的化学式为C6H7KO2,试回答:

1)山梨酸钾         种元素组成

2)山梨酸钾的相对分子质量为        

3)山梨酸钾中钾元素的质量分数为                 

答案

1)四  2  150   326%

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