+)Ở 50 độ C, S_AgNO3=455g
=> Cứ 555g dung dịch bão hòa AgNO3 có 455g AgNO3, 100g H₂O
Vậy 75g dung dịch bão hòa AgNO3 có x g AgNO3,y g H₂O
=>\(\dfrac{555}{75}=\dfrac{455}{x}=\dfrac{100}{y}\)
=> x=61,486 g
y=13,514 g
+)Ở 20 độ C: S_AgNO3=222g
Gọi khối lượng AgNO3 bị tách khỏi là a(g)
=> m_AgNO3=61,486-a (g)
=>Cứ 100g H₂O hòa tan tối đa 222g AgNO3
Vậy 13,51 g H2O hòa tan tối đa (61,486-a) g AgNO3
=> 61,486-a=\(\dfrac{13,51.222}{100}\)

=> a=31,486 (g)

Vậy khối lượng AgNO3 bị tách ra là 31,486 g

1. Vì sao thực dân Pháp xâm lược Việt Nam?

2.Phân tích nguyên nhân khiến nhà Nguyễn phải đầu hàng thực dân Pháp ?

3.TRình bày khái quát phong trào Cần Vương. Phong trào nông dân Yên Thế. Em đánh giá như thế nào về những phong trào này?

4. Kể tên những cuộc khởi nghĩa tiêu biểu trong phong trào Cần Vương. Cuộc khởi nghĩa nào tiêu biểu nhất? Vì sao?

5. Kể tên các sĩ phu tiêu biểu trong cuộc cải cách Duy Tân thể kỉ 19.Vì sao các đề nghị cải cách đó ko đc thể hiện. Liên hệ vs những cải cách cùng thời ở châu Á

a) PTHH: CH₄+ 2O₂ -> CO₂ + 2H₂O

b) Theo bài cho, ta có:

n_CH4 = \(\dfrac{6,4}{16}=0,4mol\)

Theo PTHH:
\(\dfrac{n_{O2}}{n_{CH4}}=2\Rightarrow n_{O2}=2.CH4=2.0,4\)

= 0,8 mol

Vậy thể tích khí oxi đã dùng là :
V_O2= n.22,4= 0,8.22,4=17,92(l)

c)

Theo PTHH:
\(\dfrac{n_{H2O}}{n_{CH4}}=2\Rightarrow n_{H2O}=2.H2O=2.0,4\)

= 0,8 mol

Vậy khối lượng nước sinh ra là :
m_H2O= n.M= 0,8.18=14,4(g)

In my opinion, living in the countryside has its own pros and cons. According to benefits, it has fresh air, quite environment and friendly neighbors. Firstly, you have a healthy life. There are no dust, no smoke and no traffic jam. The air is fresh and the rain is also very clean. You can get raging water to cook rice and certainly have and tasted meal. Secondly, living in the countryside is peacful. It is very quiet to relax after working or there are many beautiful wide fields and fresh air.Finally, there are no separations in your town. Your neighors are friendly and helpful. They are really best friends. They will help you pleasently if you have trouble. Each problem has its solution anf your neighbors will share it for you. In conclusion, I prefer to live in the countryside, but I don't want to live there permanently.

(.)

In my opinion, living in the countryside has its own pros and cons. According to benefits, it has fresh air, quite environment and friendly neighbors. Firstly, you have a healthy life. There are no dust, no smoke and no traffic jam. The air is fresh and the rain is also very clean. You can get raging water to cook rice and certainly have and tasted meal. Secondly, living in the countryside is peacful. It is very quiet to relax after working or there are many beautiful wide fields and fresh air.Finally, there are no separations in your town. Your neighors are friendly and helpful. They are really best friends. They will help you pleasently if you have trouble. Each problem has its solution anf your neighbors will share it for you. In conclusion, I prefer to live in the countryside, but I don't want to live there permanently.

In my opinion, living in the countryside has its own pros and cons. According to benefits, it has fresh air, quite environment and friendly neighbors. Firstly, you have a healthy life. There are no dust, no smoke and no traffic jam. The air is fresh and the rain is also very clean. You can get raging water to cook rice and certainly have and tasted meal. Secondly, living in the countryside is peacful. It is very quiet to relax after working or there are many beautiful wide fields and fresh air.Finally, there are no separations in your town. Your neighors are friendly and helpful. They are really best friends. They will help you pleasently if you have trouble. Each problem has its solution anf your neighbors will share it for you. In conclusion, I prefer to live in the countryside, but I don't want to live there permanently.

2. In my opinion, living in the countryside has its own pros and cons. According to benefits, it has fresh air, quite environment and friendly neighbors. Firstly, you have a healthy life. There are no dust, no smoke and no traffic jam. The air is fresh and the rain is also very clean. You can get raging water to cook rice and certainly have and tasted meal. Secondly, living in the countryside is peacful. It is very quiet to relax after working or there are many beautiful wide fields and fresh air.Finally, there are no separations in your town. Your neighors are friendly and helpful. They are really best friends. They will help you pleasently if you have trouble. Each problem has its solution anf your neighbors will share it for you. In conclusion, I prefer to live in the countryside, but I don't want to live there permanently.

In my opinion, living in the countryside has its own pros and cons. According to benefits, it has fresh air, quite environment and friendly neighbors. Firstly, you have a healthy life. There are no dust, no smoke and no traffic jam. The air is fresh and the rain is also very clean. You can get raging water to cook rice and certainly have and tasted meal. Secondly, living in the countryside is peacful. It is very quiet to relax after working or there are many beautiful wide fields and fresh air.Finally, there are no separations in your town. Your neighors are friendly and helpful. They are really best friends. They will help you pleasently if you have trouble. Each problem has its solution anf your neighbors will share it for you. In conclusion, I prefer to live in the countryside, but I don't want to live there permanently.

Tóm tắt:
S1= 27km=0,027m
t1=30 phút=0,5 s
S2=48m
t2=3s
Chuyện động nhanh?
Chuyện động chậm?
Giải:
Vận tốc chuyển động của vật thứ nhát là:
V1=\(\dfrac{S1}{t1}\)=\(\dfrac{0,027}{0,5}\)=0,054(m/s)
Vận tốc chuyển động của vật thứ hai là:
V2=\(\dfrac{S2}{t2}=\dfrac{48}{3}\)=16(m/s)
Vậy vật thứ hai chuyển động nhanh nhất
vật thứ nhất chuyển động chậm nhất