解方程：x/x-1- 2/x=1

-DidyouhearthatJohnlosthisjob?

-It_______thathehadmadesomeseriousmistakesinhiswork.

-Whoknowswhatpandasandsheeplikeeating?

-Iknowpandaslikeeating_______andsheeplikeeatinggrass.

Momaskedmeto_____________grandpawhenshewasout.

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)