题目

（4分）（1）在标准状况下，某气体的密度为2.86 g/L,则其相对分子质量为­­­___________（取整数值）。（2）1.2 g RSO4中含0.01 mol R2+，则R的摩尔质量是             。  答案：（4分 每空2分）64    24g/mol解析:略 My name is Jack Green, Jack is my first name and Green is my family name. I’m an American(美国) boy . My telephone number is 5689. Look! This is my ID card .It’s blue. The number is 0839.根据短文内容选择正确答案：小题1:Green is Jack’s(杰克的) ________A. first name        B.family name      C.Chinese name小题2:Jack is __________A.an American boy   B.a Chinese boy    C.an American girl小题3:His telephone number is _________A.5689             B.0839            C.6986小题4:What color is his ID card ? It’s __________A.blue             B.black           C.white小题5:His ID card number is ________A. zero nine three eightB.zero three eight nineC.zero eight three nine