题目

（1）3.01×1023个NH4+含有质子的物质的量是____ ，含有电子的物质的量是_____；（2）200mL 2mol/L的Al2(SO4)3溶液中SO42﹣的物质的量浓度为_____ ；（3）标准状况下，36g H2和O2组成的混合气体的体积是67.2L，则混合气体中H2和O2的体积比为______；（4）标准状况下，将33.6LNH3溶于水配成500mL溶液，该溶液的物质的量浓度为____；（5）已知1.505×1023个A气体分子的质量为31g，则A气体的摩尔质量是______。听下面一段材料，回答第1-3题。 1. Where does this conversation probably take place?A. In a hotel. B. In a library. C. On the phone. 2. When is the library closed on weekdays?A. At 6:00 pm. B. At 6:30 pm. C. At 8:00 pm. 3. How long is the library open on Saturday? A. Eight hours. B. Nine hours. C. Eleven hours.