hối lượng riêng của dung dịch H2SO4 68% là: 

1.84g×0.68=1.2512 g/ml

Io=qo.w=0,2.500=100(mA)=0,1(A) => Chọn B

Để đạt yêu cầu thì phải giảm đi :

      9 * 2 + 7 = 25 (đơn vị)

                 Đ/s: 25 đơn vị

The line graph details the actual salt intake in two genders and the recommended amount in the US in the year of 2000.

The initial impression from the graph is that males were more likely to consume salt in larger amounts than female counterparts regardless of age. Interestingly, except children under 6 and women over 60, people were consuming much more salt than the recommended amount for adults during the surveyed period.

Young children under 6 consumed the least salt in their diet among six age brackets, at around 2250 milligrams for boys and 1300 milligrams for girls. These figures were almost half of the consumption of adults aged 20 to 39, with men and women consuming 4500 and 3000 milligrams, respectively, far exceeding the recommended amount of 2500 milligrams.

Boys from 6 to 11 consumed the same 3500 milligrams of salt as men above 60. Male teenagers and middle-aged men from 40 to 60 ate slightly more salt, 4300 milligrams and 4200 milligrams, respectively. Female individuals from aforementioned age ranges 6-11, 12-19, 40-60 included the same amount of salt in their diet, approximately 3000 milligrams. Meanwhile, women over the age of 60 consumed exactly the recommended amount of 2500 milligrams of salt. 

Từ công thức M2(SO4)3 → M có hóa trị III.

Mà gốc NO3 có hóa trị I → công thức muối nitrat của kim loại M là M(NO3)3.

I,Turn these sentences into negative and interrogative fomr.

1.We will go for a long walk soon.

(-) We won't go for a long walk soon.

(?) Will we go for a long walk soon ?

2.A lift will take US to the top floor of the hotel.

(-) A lift won't take US to the top floor of the hotel

(?) Will a lift take US to the top floor of the hotel?

3.She will meet him tomorrow

(-) She won't meet him tomorrow

(?) Will she meet him tomorrow?

4.Her will play games online with his friends

(-) Her won't play games online with his friends

(?) Will Her play games online with his friends?

5.It will be quite impossible

(-) It won't be quite impossible

(?) Will it be quite impossible?

6.They will understannd your problem

(-) They won't understand your problem

(?) Will they understannd your problem?

7.He will come at two o'clock tomorrow.

(-) He won't come at two o'clock tomorrow.

(?) Will he come at two o'clock tomorrow?

8.The new park will cover a very great area

(-) The new park won't cover a very great area

(?) Will he new park cover a very great area ?

9.They will know the answer tomorrow

(-) They won't know the answer tomorrow

(?) Will they know the answer tomorrow?

10.The teacher will give us a test next week.

(-) The teacher won't give us a test next week.

(?) Will the teacher give us a test next week?

D ạ

Nguyễn Tuấn Kiệt B nhé