向8 g某+2价金属的氧化物固体中加入稀硫酸，使其恰好完全溶解，已知所消耗的硫酸
题型：计算题
问题：
向8 g某+2价金属的氧化物固体中加入稀硫酸，使其恰好完全溶解，已知所消耗的硫酸体积为100 mL，在所得溶液中插入铂电极进行电解，一定时间后，在一个电极上收集到标准状况下224 mL氧气，在另一个电极上得到1.28 g金属。
(1)根据计算确定金属的名称。
(2)计算通电后所得硫酸溶液的物质的量浓度(溶液体积按100 mL计算)。
题型：计算题
PE classes have become a nightmare (噩梦) for Liu Fei, a 15-year-old student. He has to run at l 小题1: 4 laps (圈) of the playground in every PE class. That’s n 小题2: 1,500 meters!
Liu is p 小题3: 40 points in the senior high school entrance examination (中考). It usually i 小题4: long-distance running, long jump, rope skipping and sit-ups (仰卧起坐).
“Now I can run 1000 meters in only 3 minutes 40 seconds, about 30 seconds f 小题5: than before.” Liu said.
A PE teacher from Zhenjiang with teaching e 小题6: of 10 years, said, “Long-distance running r 小题7: lots of energy and endurance (耐力), which cannot be gained in a short time.
Taking up other activities early is also n 小题8:. Teachers will teach you some skills and you need time to practice.
Training is important, but don’t forget to protect yourself. He s 小题9: that students should warm up before training. Start slowly and build up the activity a little at a time.