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（8分）石灰石的主要成分为CaCO 3 （其余杂质不溶于水，亦不参加反应）。某化学兴趣小组为了测定石灰石中CaCO 3 的质量分数，进行了以下探究实验：称石灰石样品二份，分别放入大烧杯中，第一个烧杯中加入50克稀盐酸，第二个烧杯中放入100克稀盐酸，充分反应至不再有气泡产生时称量残留物质量，有关数据如下表。求：（1）二个烧杯中CO 2 的质量；（2）石灰石样品中CaCO 3 的质量分数；（3）稀盐酸中溶质的质量分数。 各物质的质量 第一个烧杯 第二个烧杯 样品质量 16g 16 g 稀盐酸质量 50g 100g 烧杯残留物质量 61.6 g 109.4g 产生的CO 2 质量
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【简答题】According to his r_______, he has worked as a sales for five years.
【简答题】Part Two. Fill in the blanks Passage two Directions: The passage will be played for three times. Please fill in the blanks of No. 1 to 6 according to the passage you hear. When Mr. Xin arrived in Amer...
【单选题】According to the speech, Hitler had believed that his attack on the U.S.S.R. would:
A.
cause conflicts between the United States and Great Britain.
B.
ignite sympathy from the right wing of the western countries.
C.
make the United States retreat from the war.
D.
lead to a conclusion of the war.
【单选题】According to Jae Kwon, his nuclear battery______.
A.
uses a solid semiconductor
B.
will soon replace the present ones
C.
could be extremely thin
D.
has passed the final test
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