Nung 15,12g kim loai R trong khong khi toi khi kim loai phan ung het, ñuợc 20,88 g oxit ran. hoa tan het luong chat ran o tren vao dd hon hop gom HCl 2M va H2SO4 1M luong vua du, pu khong giai phong khi. Viet PTPU tinh the tich dd axit can dung va tong so gam muoi tao ra. R la kim loai gi? tim cong thuc cua oxit

* Cách sử dụng Enough và Too

* Dùng Enough (đủ) và Too (quá) trong các trường hợp dưới đây:

1, This soup is very hot. We can't eat it. =>

2, These oranges are rip. You can eat them. =>

3, This morning is very cold. We couldn't go swimming. =>

4, She can't carry the box; it's very heavy. =>

5, The room was very dirty. Nobody can learn it. =>

6, It was very late. She couldn't go home. =>

7. The class was very tired. The teacher couldn't explain the lesson. =>