题干

某化学小组利用下图所示装置测定铜锌合金样品中锌的质量分数(图中固定装置已略去)

探究过程如下:

Ⅰ.连接实验装置并检查装置气密性

Ⅱ.向B中加入质量为m的铜锌合金粉末,由注射器A向B缓缓加入稀硫酸,待B中不再有气体产生气体时,夹紧弹簧夹,立即移出D中导管,准确读取并记录量筒内水的体积.

Ⅲ.经过滤等操作,准确称量并记录B中剩余固体物质的质量.

IV.该小组的甲同学根据反应前后B中固体物质的质量计算样品中锌的质量分数;乙同学认定量筒内测得水的体积即为反应生成气体的体积,并利用该气体在常温下的密度,根据化学方程式进行相关计算,得到样品中锌的质量分数.

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