Write a compositionon why you think it is important or interesting to travel. You may base your writing on what you have learned from the unit as well as your own personal experiences.
【简答题】食物调料中八角的主要成分是莽草酸(C 7 H 10 O 5 ),莽草酸是白色粉末,气味辛酸,易溶于水,难溶于氯仿、苯和石油醚,熔点185℃~l 87℃;具有抗炎、镇痛等作用.根据上述信息回答问题: (1)莽草酸中碳元素与氢元素的质量比是______;每个莽草酸分子中含有______个原子. (2)写出莽草酸的一点物理性质:______.