题目

实验室取68 g过氧化氢溶液和2 g二氧化锰混合制取氧气,充分反应后,称量剩余溶液和滤渣为68.4 g。求: (1)充分反应后,生成氧气的质量为________g; (2)参加反应的过氧化氢溶液中溶质的质量分数。 答案:(1)1.6g   (2)5%6、 (2010年皖南八校三次联考)The high housing price has become a serious problem among young people in China,________the government hasn’t found a better solution to solve yet. A.the one                  B.that C.one                       D.those
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