10 ; 12 ; 14 ; 16 ; 18

(Số cần điền vào chỗ chấm là số đã in đậm)

TL

10;12;14;16;18 NHA

ht

Tham khảo:

Hi everyone, my name is Phuong. I will introduce my family to you. Our family has 4 people including my father, my mother, my younger brother and me. My father is an engineer at a construction site near my home. My father is very busy. He usually had to stand outside all day. So he has a tanned skin. However, one day he still spends time playing with me. My mother is a good housewife. Every day I can eat delicious dishes that I cook. Mother takes care of her family very well. Before I go to bed, my mother usually reads me a story. My brother is 10 years old this year. Very good boy. I often play with him in my free time so my mom can do other things. I love my family very much.

_HT_

I love and am proud of my family. My small family is always filled with the laughter of my father, the warm voice of my mother and the excitement of my younger brother. My father was originally a soldier fighting in the battlefield, still working in the military until now. Perhaps because of years of struggle and training, my father became more upright and strict but also very funny and witty. On the outside, his father is a tough man, but on the inside, he is very emotional. Dad is a solid pillar in the family. Dad is not only a spiritual support for my mother but also everything for my sisters. Un her father and mother, she is a weak, gentle and courageous woman. Vietnamese women have always been, their mother worked hard and sacrificed without a word of complaint. Mother always considers taking care of the family as happiness. For us, mother is both the greatest friend and teacher. My parents are idols in my heart. The funniest, most active person in the family is none other than the six-year-old brother. This year, it will enter first grade. Looking at him excitedly preparing everything for the new school year, I felt I was seeing myself again five years ago, just as innocent and pure. Although I am very active, I am obedient and very intelligent. My sisters and I can play together all day without getting bored. If one day without your voice and laughter, my family seems empty, especially I will miss you so much... My little family is so happy. There will also be difficult times or storms, but my family will always be resilient because everyone has a loving and trusting heart.

TL

bằng 102223

nha

_HT_

= 102223 nha bn lữ bố

=111111113 nhé

111111113

ht

tick nhé

2 nhé em

=2 nha

HT

... ko hiểu

Cái này là bài lớp 4 lớp 5 chứ ko phải lớp 1

vịt diếc là vịt 

hư tai hư tai là 24

Vậy có 24 con vịt

HT

24 con à

HT

T xin mày luôn đấy Đoàn ạ =))))))

Đáp án B

Gọi số mol của axit, ancol và este lần lượt là a, b, c (mol)

Bảo toàn nguyên tố O ta có: 4a + b + 4c = 0,16 (mol) (1)

Từ (1); (2) và (3) ta có: a = 0,025 mol; b = 0,02 mol; c = 0,01 mol bảo toàn khối lượng ta có:

mX + mNaOH phản ứng = mmuối hữu cơ + mH2O + mancol

Trong đó: 

 mmuối hữu cơ = 5,18 (g)

Khối lượng chất rắn bao gồm muối hữu cơ và 0,01 mol muối NaCl.

Vậy m = mmuối hữu cơ + mNaCl = 5,765(g)

Nhận xét: Đây là một bài toán hay và khó, các bạn cần hiểu và vận dụng thật linh hoạt phương pháp trung bình và bảo toàn nguyên tố. Ta cũng có thể bảo toàn khối lượng từ đầu đến cuối như sau:

mX + mNaOH + mHCl = mmuối khan + + mancol

Tuy nhiên khi đó

= 2naxit hữu cơ + nHCl = 0,06 (mol)

=-11111

=-11111 nha

dài quá ko ra

 =5.465888389x10^14 nha

HT