题目

M（NO3）2热分解的反应方程式为2M（NO3）22MO＋4NO2↑＋O2↑,加热29.6g M（NO3）2使其完全分解，在标准状况下得到2.24L氧气，则M的摩尔质量是     A. 24 g/mol    B. 24    C. 64 g/mol    D. 64 答案：A阅读短文，判断对（T）错（F）。      Yesterday was March 18th.  It was Sunday.  My friend Han Meimei was very busy. In  the morning she got up early, and then she helped her mother water the flowers and clean the rooms.  After lunch she slept for an hour and then she did her homework for two hours. She went out and played games with her friends at about 4:30.  In the eve-ning she felt very tired and went to bed at 8:00.(     ) 1. Yesterday Han Meimei was very busy and tired.(     ) 2. Yesterday morning Hai Meimei watched TV for two hours.(     ) 3. Han Meimei helped her mother water the flowers in the afternoon.(     ) 4. Han Meimei didn't get up early.(     ) 5. Han Meimei played games with her friends yesterday afternoon.