Trong $FeS_2$ có $\%S=\dfrac{32.2.100}{120}=\dfrac{160}{3}\%$

Trong 320 tấn quặng có $m_S=320.45\%=144$ tấn 

$\Rightarrow m_{FeS_2}=144:\dfrac{160}{3}\%=270$ tấn

$FeS_2\to 2H_2SO_4$ 

Tỉ lệ: cứ 120 tấn $FeS_2$ tạo $98.2=196$ tấn axit 

$\Rightarrow m_{H_2SO_4}=\dfrac{270.186}{120}=441$ tấn 

Thực tế $m_{H_2SO_4}=506,25.80\%=405$ tấn

$\to H=\dfrac{405.100}{441}=91,8\%$

Hello, today I will tell you what I think about city under the sea. It's very big and clean. The people are very friendly and kind. They are living sociable with each other. It has a big palace, fresh air, modern machine, modern street.... It will be famous tourist attraction and many people will know about it. Though only in my mind but I hope something I think today will be the truth. I like it very much

Dịch nghĩa

Xin chào, hôm nay tôi sẽ cho bạn biết những gì tôi nghĩ về thành phố dưới đáy biển. Nó rất lớn và sạch sẽ. Người dân rất thân thiện và tốt bụng. Họ đang sống hòa đồng với nhau. Nó có một cung điện lớn, không khí trong lành, máy móc hiện đại, đường phố hiện đại .... Nó sẽ là địa điểm du lịch nổi tiếng và nhiều người sẽ biết về nó. Mặc dù chỉ có trong tâm trí của tôi, nhưng tôi hy vọng một cái gì đó tôi nghĩ rằng hôm nay sẽ là sự thật. tôi rất thích nó

I was born and grown up on the poor land in Duc Tho district, Ha Tinh province. That’s where deeply attaches to me 24 years of life. If anyone who asks me that “What’s the thing your most proud of?” .I will answer that’s my hometown. Duc Tho is the land poor where the people live by rice cultivation, breeding, and fishing. Although the life is very difficult, but the people is very friendly, and studious. In Duc Tho, there is a Tung Anh village where called “Doctor village”. Duc Tho is also the home of Tran Phu Secretary General, and marked many memories of the great leader Ho Chi Minh.

If you come to Duc Tho, you will feel many interesting things, visiting Tran Phu tombstone, La Giang dyke, rowing on La driver, and enjoying the traditional songs. In the evening, they can enjoy a special food which is “mussel rice” – just only eat one time, you will never forget.

Beautiful and unobtrusive! Duc Tho always tries to grow, and to improve the life of people, but keeping the traditional culture.

I was born and grown up on the poor land in Duc Tho district, Ha Tinh province. That’s where deeply attaches to me 24 years of life. If anyone who asks me that “What’s the thing your most proud of?” .I will answer that’s my hometown. Duc Tho is the land poor where the people live by rice cultivation, breeding, and fishing. Although the life is very difficult, but the people is very friendly, and studious. In Duc Tho, there is a Tung Anh village where called “Doctor village”. Duc Tho is also the home of Tran Phu Secretary General, and marked many memories of the great leader Ho Chi Minh.

If you come to Duc Tho, you will feel many interesting things, visiting Tran Phu tombstone, La Giang dyke, rowing on La driver, and enjoying the traditional songs. In the evening, they can enjoy a special food which is “mussel rice” – just only eat one time, you will never forget.

Beautiful and unobtrusive! Duc Tho always tries to grow, and to improve the life of people, but keeping the traditional culture.

Bài dịch

“Tôi sinh ra và lớn lên trên miền đất nghèo thuộc huyện Đức Thọ, tỉnh Hà Tĩnh. Đó là nơi gắn bó với tôi 24 năm cuộc đời. Nếu có ai hỏi tôi rằng “Điều gì làm tôi tự hào nhất?”. Tôi sẽ trả lời đó chính là quê hương tôi. Đức Thọ là mảnh đất nghèo, người dân ở đây sống bằng nghề trồng lúa, chăn nuôi và đánh cá. Mặc dù cuộc sống vất vả, nhưng con người ở đây rất thân thiện và hiếu học. Đức Thọ có một ngôi làng Tùng Ảnh, được gọi là làng tiến sỹ. Đức Thọ cũng chính là quê hương của cố tổng bí thư Trần Phú, và đã ghi nhiều dấu ấn của lãnh tụ Hồ Chí Minh vĩ đại.

Nếu đặt chân đến Đức Thọ, bạn sẽ cảm nhận được nhiều điều thú vị, đi tham quan mộ cố tổng bí thư Trần Phú, đê La Giang, chèo thuyền trên sông La, và nghe câu hò ví dặm. Khi hoàng hôn xuống, cùng nhau thưởng thức cơm hến – một đặc sản ẩm thức chỉ ăn một lần là nhớ.

Đẹp và bình dị ! Đức Thọ luôn luôn cố gắng để đổi mới, cải thiện đời sống nhân dân, nhưng luôn giữ gìn bản sắc quê hương đậm đà’’.

Đó là đoạn văn tiếng anh của tôi viết về nơi tôi sống, và thông qua đoạn văn này tôi muốn gửi gắm tình yêu tha thiết đối với quê hương nghèo khó nhưng nghĩa tình. Còn bạn ? Hãy viết một đoạn văn giới thiệu bản thân bằng tiếng anh với chủ đề về nơi mình sinh sống và đừng quên chia sẻ với Aroma nhé !

5 câu nha bn !

My neiborhood is not big, but it has a nice view. But, some year recently, people often do not take rubbish into recycle bins, walk on the grass, use more dirty energy, noise pollution,.... So I dis something much. Althought my neighbor is so dirty, peole here improve themselevs. I my neighborhood because it's my homeland, the peole here so friendly, there are a lot of parks, supermarkets, schools,... here.

My neiborhood is not big, but it has a nice view. But, some year recently, people often do not take rubbish into recycle bins, walk on the grass, use more dirty energy, noise pollution,.... So I dislike something much. Althought my neighbor is so dirty, peole here improve themselevs. I like my neighborhood because it's my homeland, the peole here so friendly, there are a lot of parks, supermarkets, schools,... here.

I like living in the countryside because of some reasons. Environmentally speaking, it is a peaceful place. The air is fresh. The space is quiet. We can enjoy healthy natural conditions without
worrying much about environmental pollution.

As for social security, the countryside is a safer place than a city. While urban security situation is always complicated with all kinds of crimes, rural areas are much more secure because most of countrymen are friendly and ready to help one another.

Moreover, rural life is also easier that in cities. People in cities are easy to get stressed because of pollution, job pressures, competitions, etc ... On the contrary, those bad things
are very rare in the countryside. To sum up, except income matters, the countryside is a better residence than cities.

I live in the suburbs of Nha Trang city. There are many good things about living in my neighbourhood. First, it has beautiful parks, sandy beaches, and sunny weather all year. So, it's very good for outdoor activities and events. Second, the traffic here is also great because the roads are wide and people follow the traffic lights very well. Also, my neighbours are incredibly friendly and helpful. You can make friends with them and ask them for help easily. It's quite inconvenient because if you want to hear some live music or watch a movie at the cinema, you have to catch a bus to the city centre. Despite that, I still love living here.

I dream of a neighborhood where it is safe and full of big green trees. A neighborhood where kids are safe to run around. My dreamed neighborhood would have houses with only one or two levels so everyone can enjoy the beautiful sunrise and sunset. The tall buildings narrow our view of the vast blue sky. Each house in the neighborhood should have a big front and back lawn. Everyone should take a good care of their lawn to make the neighborhood looks nice. All of the houses in the neighborhood should have central air so that when the weather is too hot to bear, you can use the air conditioning. When it's freezing cold out, you can use the heater to warm the house up. There should be a school and a park nearby so that the kids can walk to fun places. These are the characteriss of my dreamed neighborhood. 

I was born and grew up in a small village of DAI TU district, in THAI NGUYEN province. It is about 150 km from here.

It is a small village because it has only a population of 1000 with a size of 3 square kilometers

There is a  primary school in the village, so it is very convenient for children to go to school. There is a small market with a lot of fresh food. The food here is cheaper and fresher than the one in the city.

My village has some nice view, such as: large fields where we can fly a kite and Cau river, where I could swim and my mother usually wash clother there.

Centre of my village is a khuon ga pagoda, it has a large yard,where we usually play badminton, tabletenis or meet each other to chat, next to the pagoda is a large lake. I going fishing here very much.

Especially, I tea of my hometown a lot, because it very delecious, I usually drink a cup of tea before I start working.

The people in my village are very hospitable, friendly, helpful and generous. They are all hard working people. They mainly live on farming and business…

Being a learner of Tran quoc Tuan university, I only come home once a month , so I miss my hometown very much.

Life in the city is full of activity. Early in the morning hundreds of people rush out of their homes in the manner ants do when their nest is broken. Soon the streets are full of traffic. Shops and offices open, students flock to their schools and the day’s work begins. The city now throb with activity, and it is full of noise. Hundreds of sight-seers, tourists and others visit many places of interest in the city while businessmen from various parts of the world arrive to transact business.

Then towards evening, the offices and day schools begin to close. Many of the shops too close. There is now a rush for buses and other means of transport. Everyone seems to be in a hurry to reach home. As a result of this rush, many accidents occur. One who has not been to the city before finds it hard to move about at this time. Soon, however, there is almost no activity in several parts of the city. These parts are usually the business centres. With the coming of night, another kind of actịvity begins. The streets are now full of colorful lights. The air is cooler and life becomes more leisurely. People now seek entertainment. Many visit the cinemas, parks and clubs, while others remain indoors to watch television or listen to the radio. Some visit friends and relatives and some spend their time reading books and magazines. Those who are interested in polis discuss the latest polial developments. At the same time, hundreds of crimes are committed. Thieves and robbers who wait for the coming of night become active, and misfortune descends upon many. For the greed of a few, many are killed, and some live in constant fear. To bring criminals to juse, the officers of the law are always on the move.

Workers and others who seek advancement in their careers attend educational institutions which are open till late in the night. Hundreds of them sit for various examinations every year. The facilities and opportunities that the people in the city have to further their studies and increase their knowledge of human affairs are indeed many. As a result, the people of the city are usually better informed than those of the village, where even a newspaper is sometimes difficult to get.

The city could, therefore, be described as a place of ceaseless activity. Here, the drama of life is enacted every day.

I live in the suburbs of Nha Trang city. There are many good things about living in my neighbourhood. First, it has beautiful parks, sandy beaches, and sunny weather all year. So, it's very good for outdoor activities and events. Second, the traffic here is also great because the roads are wide and people follow the traffic lights very well. Also, my neighbours are incredibly friendly and helpful. You can make friends with them and ask them for help easily. However, there is one thing I don't about living here. It's quite inconvenient because if you want to hear some live music or watch a movie at the cinema, you have to catch a bus to the city centre. Despite that, I still love living here.

I was born and grew up in a small village of DAI TU district, in THAI NGUYEN province. It is about 150 km from here.

It is a small village because it has only a population of 1000 with a size of 3 square kilometers

There is a  primary school in the village, so it is very convenient for children to go to school. There is a small market with a lot of fresh food. The food here is cheaper and fresher than the one in the city.

My village has some nice view, such as: large fields where we can fly a kite and Cau river, where I could swim and my mother usually wash clother there.

Centre of my village is a khuon ga pagoda, it has a large yard,where we usually play badminton, tabletenis or meet each other to chat, next to the pagoda is a large lake. I going fishing here very much.

Especially, I tea of my hometown a lot, because it very delecious, I usually drink a cup of tea before I start working.

The people in my village are very hospitable, friendly, helpful and generous. They are all hard working people. They mainly live on farming and business…

Being a learner of Tran quoc Tuan university, I only come home once a month , so I miss my hometown very much.

Life in the city is full of activity. Early in the morning hundreds of people rush out of their homes in the manner ants do when their nest is broken. Soon the streets are full of traffic. Shops and offices open, students flock to their schools and the day’s work begins. The city now throb with activity, and it is full of noise. Hundreds of sight-seers, tourists and others visit many places of interest in the city while businessmen from various parts of the world arrive to transact business.

Then towards evening, the offices and day schools begin to close. Many of the shops too close. There is now a rush for buses and other means of transport. Everyone seems to be in a hurry to reach home. As a result of this rush, many accidents occur. One who has not been to the city before finds it hard to move about at this time. Soon, however, there is almost no activity in several parts of the city. These parts are usually the business centres. With the coming of night, another kind of actịvity begins. The streets are now full of colorful lights. The air is cooler and life becomes more leisurely. People now seek entertainment. Many visit the cinemas, parks and clubs, while others remain indoors to watch television or listen to the radio. Some visit friends and relatives and some spend their time reading books and magazines. Those who are interested in polis discuss the latest polial developments. At the same time, hundreds of crimes are committed. Thieves and robbers who wait for the coming of night become active, and misfortune descends upon many. For the greed of a few, many are killed, and some live in constant fear. To bring criminals to juse, the officers of the law are always on the move.

Workers and others who seek advancement in their careers attend educational institutions which are open till late in the night. Hundreds of them sit for various examinations every year. The facilities and opportunities that the people in the city have to further their studies and increase their knowledge of human affairs are indeed many. As a result, the people of the city are usually better informed than those of the village, where even a newspaper is sometimes difficult to get.

The city could, therefore, be described as a place of ceaseless activity. Here, the drama of life is enacted every day.

I was born and raised in Nghia Trung, Viet Yen, Bac Giang. Here is the place where I love the best. It is a peaceful place. The air is fresh. The space is quiet. We can enjoy healthy natural conditions without worrying much about environmental pollution. As for social security, my village is a safer place than a city. Morever, people here are friendly and ready to help each other. Most of them live on agriculture and breeding cattle as well as poultry. So the food there are always fresh and tasty. Although I go anywhere, I still think of my village, Nghia Trung .

My neiborhood is not big, but it has a nice view. But, some year recently, people often do not take rubbish into recycle bins, walk on the grass, use more dirty energy, noise pollution,.... So I dis something much. Althought my neighbor is so dirty, peole here improve themselevs. I my neighborhood because it's my homeland, the peole here so friendly, there are a lot of parks, supermarkets, school, ... here.