問題詳情
4. A 2.5 g sample of groundwater was found to contain 5.0 ng of Cr6+, what is the concentration of Cr6+in parts per million? Cr: 52.0 u
(A)2.0 ppm
(B)0.2 ppm
(C)0.02 ppm
(D)0.002 ppm
(E)0.0002 ppm
參考答案
答案：D
難度：簡單0.636
書單：沒有書單，新增
用户評論
【用戶】CC
【年級】高三上
【評論內容】5*10-6mg/2.5*1.....觀★★★★★，...