Hòa tan hoàn toàn 12,1(g) hỗn hợp bột CuO và ZnO vào 150ml dd HCl 2M a - Tính thành phần % theo khối lượng mỗi oxit trong hỗn hợp đầu b - Tính khối lượng dd H2SO4 20% cần để hòa tan hỗn hợp trên.

Các câu hỏi liên quan

I) 1. Is there some water in the bottle? A B C D 2. There are any children in your room. A B C D 3. She would likes some milk and bananas. A B C D II. Make questions from the words underlined: 1.I’d like some rice and chicken for dinner……………………………………………………. 2.A cake is 5,000 đ……………………………………………………………………………. 3.I feel tired …………………………………………………………………………………….. 4.I went fishing with my friends yesterday …………………………………………………… 5.Yes. I often play badminton in the fall. ……………………………………………………… 6.It’s warm in the spring. ………………………………………………………………………. 7.They are playing table tennis at the moment ………………………………………………… 8.I play soccer ………………………………………………………………………………….. 9.She did aerobics last day …………………………………………………………… 10.He wanted a kilo of rice ……………………………………………………………………… III. Arrange the words into the sentence: 1.want / Tom / Mary / and / glasses / two / of / water. ……………………………………………………………………………………………………………. 2.children / for / her / oranges / and / some / apples / going / buy / to / is / Mrs Lan. ……………………………………………………………………………………………………………. 3.sister / my / going / is / to / live / country / the / in. ……………………………………………………………………………………………………………. 4.going / dinner / tonight / is / have / to/ where / Lan? ……………………………………………………………………………………………………………. 5.go / to / next / weekend / are / you / going / where? ……………………………………………………………………………………………………………. 6.the / spring / in / what / weather / is / like / the? ……………………………………………………………………………………………………………. 7.building / tallest / the / is / this / city / the / in / world. ……………………………………………………………………………………………………………. 8.Lan’s house / smaller / is / house / my / than. ……………………………………………………………………………………………………………. 9.she / never / with / camping / goes / her / friends. ……………………………………………………………………………………………………………. 10.often / she / go / does / how / cinema / to / the? ……………………………………………………………………………………………………………. II) A B C D