Hòa tan hoàn toàn 2,81 gam hỗn hợp gồm Fe₂O₃, MgO, ZnO trong 500 ml axit H₂SO₄ 0,1M (vừa đủ). Sau phản ứng, hỗn hợp muối sunfat khan thu được khi cô cạn dung dịch có khối lượng là

A. 6,71 gam

B. 4,81 gam

C. 6,81 gam

D. 7,61 gam

history

me

a 

a 

b

c

a

d

không có phương trình bạn nhé

Warning of obesity possibly seen in children due to their mothers’ overeating fish during pregnancy

Children of some mothers who consume too much fish during pregnancy, concretely 3 courses per week, will have higher possibility of being obese in the early years than children who their mother eat less fish.
The American scientists have given the bellow alert in research works section published on journal of the American Medical Association issued on February 15th.
To come to that conclusion, scientists in the Crete University carried out to analyse the information of 26000 pairs of mother and child in America and many European nations.
The output indicated that children whose mothers eat more than 3 meals of fish per week are at higher risk of getting obesity than children whose mothers eat less.
In addition, pregnant mothers eat too much fish that also increase the rate of be affected by toxic chemicals frequently found in fish, specially mercury, which produces a side-effect harmful to a foetus.
According to the scientists, fish and assorted seafood provide to a pregnant mother and her child with a source of sufficient nutrients, helping develop a child’s brain. However, pregnant mothers should take notes that they just need to have a maximum of 3 fish course per week and essentially eat natural kinds of fish, not the intoxicated one.

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