Lấy 1283g dung dịch Na₂SO₄ bão hòa ở 80 độC cho vào cốc (dung dịch A, cho thêm 45,53g Na₂SO₄ khan vào dung dịch A thì thấy có 161g timh thẻ ngậm nước tách ra.Biết đọ tan của NA₂SO₄ ở 8O độ là 28.3g .xác định công thứ tinh thể ngậm nước                                                              giúp mình với ạ

VIII. Read the passage and decide whether the statements are True (T) or False (F).

There are many causes that lead to water pollution. One main cause of this issue is waste water coming from many factories and then being directly pulled out into water bodies, especially into rivers or seas without any treatment because this is the most convenient way of disposing waste water. Industrial waste consists of some kinds of chemical substances such as sulphur, which is harmful for marine life. Lead is known as the main reason for cancer disease. Cancer has become a popular disease in several communes which are called “cancer villages”. Another cause is the awareness of citizens, people always use water for many purposes and then they dump waste water or garbage directly into rivers, canals and ponds and so on. In 2004, because of a bird flu outbreak in Viet Nam, people threw poultry to water body that made water highly polluted.

1. Waste water from many factories which is dumped into water bodies directly causes water pollution.

2. Dumping waste directly into water is the most convenient way of disposing waste water. 3. Sulphur is believed the main reason for cancer.

4. Cancer villages occurred in 2004.

5. Due to lack of awareness, people poisoned water with dead poultry when there was a bird flu outbreak in 2004.

VIII. Read the passage and decide whether the statements are True (T) or False (F).

     There are many causes that lead to water pollution. One main cause of this issue is waste water coming from many factories and then being directly pulled out into water bodies, especially into rivers or seas without any treatment because this is the most convenient way of disposing waste water. Industrial waste consists of some kinds of chemical substances such as sulphur, which is harmful for marine life. Lead is known as the main reason for cancer disease. Cancer has become a popular disease in several communes which are called “cancer villages”. Another cause is the awareness of citizens, people always use water for many purposes and then they dump waste water or garbage directly into rivers, canals and ponds and so on. In 2004, because of a bird flu outbreak in Viet Nam, people threw poultry to water body that made water highly polluted.

1. Waste water from many factories which is dumped into water bodies directly causes water pollution.

2. Dumping waste directly into water is the most convenient way of disposing waste water.

3. Sulphur is believed the main reason for cancer.

4. Cancer villages occurred in 2004.

5. Due to lack of awareness, people poisoned water with dead poultry when there was a bird flu outbreak in 2004.

people dump wastes and poisonous chemicals into water

                                   ↓

tiny animals eat pollutants in polluted water

                                   ↓

fish and shellfish eating tiny animals contain poison in their bodies

                                   ↓

people who eat these fish et some diseases

                                   ↓

they have to go to hospital

                                   ↓

their family members take care of them

6. If

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