2molCl2和2molSO2相比较，下列叙述中正确的是（ ）
A．分子数相等
B．原子数相等
C．体积相等
D．质量相等
A、由于氯气和二氧化硫的物质的量相同，含有的分子数相等，故A正确；
B、由于2mol氯气含有2mol原子，2mol二氧化硫含有6mol原子，原子数不相等，故B错误；
C、题中没有告诉是否在相同条件下，无法比较体积大小，故C错误；
D、氯气和二氧化硫的摩尔质量不同，物质的量相等，质量一定不相等，故D错误；
故选A．
| 完形填空。 American people like to 1 "Thank you" when others help them or say 2 to them. Many Chinese people do so, 3 . It is a very 4 . You must say "Thank you" when someone passes you something on the table, when someone 5 the door open for you, when someone says you do your work 6 , or you buy a nice thing or your city is 7 . "Excuse me" is another sentence (句子) they often say. When you hear someone say "Excuse me" 8 you, you know he wants to pass you without touching (接触) you. If you want 9 others, say "Excuse me" first, and then begin talking. Let's 10 "Thank you: and "Excuse me" from now. | ||||
|