题目

Every mother is great, so is my mother. My mother is a common worker. But I love her very much. She is tall and of medium build. She has two big eyes. Her hair is black and curly. I think she is very beautiful. My mother likes telling stories. She also likes helping others. So she is popular. She is hard-working like many other mothers. Whenever she is at home or at work, she is always busy. On weekends, she often cleans our house, so our house is very clean and tidy. And she likes planting flowers, too. She often says, “Flowers are beautiful. Planting flowers is fun and exciting. Flowers ca16．有机物A可以作为无铅汽油的抗爆震剂，它的相对分子质量为88.0，其中碳元素的质量分数为68.2%，氢元素的质量分数为13.6%，其余为氧．（1）求该有机物的分子式（写出必要的计算步骤）．（2）经红外光谱和核磁共振氢谱显示该分子中有4个甲基，写出A的结构简式．