阅读理解

    Babies like sitting in the prams which are pushed by their mothers along the road or in the park. They sit in the prams eating, drinking, laughing or sleeping.

    But have you ever heard of the Pram Race before? It is held in Hull, England once a year. You might see some people running along the road and pushing the prams as fast as they can. However, there aren't any babies in the prams, but adults instead. They jump out of the prams and drink lots of milk on the table along the road. Then they get into the prams and go on racing. The Pram Race is held to raise money for the people in need. For example, it helps to make it possible for disabled people to have wheelchairs for free.

    It all started when Hull was a fishing town. Every Friday afternoon, fishermen's wives had to run, pushing the prams with their babies in. They took money to pay their bills and buy food rapidly before their husbands returned from the sea.

    At the beginning only a few people were interested in the race, but now quite a lot of people including children, teenagers and the old take part in it each year. It is watched by more than three thousand people. These days, the Pram Race has become more famous in the town. People can not only watch the exciting race, but also share their joy and friendship every year. If you want to watch the Pram Race, go to Hull.

小红测量某种液体密度时，按照下列顺序进行了操作：

①用天平测出烧杯和液体的总质量m₁；

②将烧杯中的一部分液体倒入量筒中，测出液体的体积V；

③用天平测出烧杯与剩余液体的总质量m₂；

④被测液体密度的表达式为ρ=____ ．

表中已经记录了最初烧杯和液体的总质量．如图甲显示的是他将烧杯中一部分液体倒入量筒后，烧杯和剩余液体的总质量，如图乙显示的是从烧杯中倒入量筒内液体的体积．请根据图中显示的情况，帮助小红完成实验数据表格的填写．

则这三种烃的二氯取代产物的同分异构体数目分别是（   ）

①图中仪器“a”的名称是____。制取气体的装置，放入药品前，均需对装置进 行____检查。

②上述装置按照不同角度可以分为两类，完成表格空白处：

若将“BCDEF”继续分为两类：“BCD”和“EF”两类，“EF”放在一起的理由是：____。

③如果实验室利用氯化铵固体与氢氧化钙固体在加热条件下得到氨气，选用的装置可以是____（选填图中装置编号）；实验室利用大理石与稀盐酸反应制取 CO₂，若要得到较 多的气体，装置宜选用____（选填图中装置编号）。

④实验室利用大理石与稀盐酸反应制取 CO₂，反应中共消耗了 3.65%的稀盐酸 100g，计算该 盐酸溶液中含 HCl 的物质的量是多少？可以得到 CO₂ 气体的质量是多少____？（请列式计算）

计算 HCl 的物质的量：____

计算 CO₂ 气体的质量：____。