-Howcanwehelpthechildreninthemountainvillage?
-Wecan_______leafletstoaskpeopletodonatemoney.
为测定某黄铜(铜、锌合金)中铜的质量分数,称取32.5g该黄铜粉末放入烧杯中,再向烧杯内加入200g稀硫酸(足量),每隔10分钟测烧杯内(不含烧杯)剩余物质的质量,测得数据如表:
(1)完全反应后生成氢气的质量为_____
(2)计算该黄铜中铜的质量分数(写出计算过程)
-Whatwouldyouliketodrink,teaorjuice?
-_______isOK.Theyarebothmyfavourite.