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18 tháng 2 2022

T xin mày luôn đấy Đoàn ạ =))))))

18 tháng 2 2022

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: = 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  + 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)

11 tháng 2 2020

buffalo;beaver;bat;boar;bull;butterfly

           HOK TỐT

7 tháng 8 2023

có nha

vd:

https://hoc24.vn/vip/11211863534848(anh POP)

https://hoc24.vn/vip/15091409695159

https://hoc24.vn/vip/8583223959383

https://hoc24.vn/vip/223316421158

https://hoc24.vn/vip/mars262008

https://hoc24.vn/vip/aquarius22

những ng giỏi hoá đó bạn

17 tháng 4 2020

-A seesaw.

- “What” is the name of the 5th child

-What is the name of the fifth one

-An ear of corn

17 tháng 4 2020

Sai 2 câu ròi bạn

(ở đây mình không nói là câu gì nha,để giữ bảo mật tuyệt đối🤔😅😅)

30 tháng 3 2022

lan có: 45 x 5/9 = 25 (nhãn vở)

lớp 1 học Phân số

hảo hán

25 tháng 2 2021

B. Luck

25 tháng 2 2021

People need this to win lottery. It is good thing to have. 

Before the test, we say "Good ......

A. Score

B. Luck

C. time

Hok tôt !

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrases that best fits each of the numbered blanks.Most Americans eat three meals (10) ______ the day: breakfast, lunch, and dinner. Breakfast begins between 7:00 and 8:00am, lunch between 11:00 am and noon, and dinner between 6:00 and 8:00 pm. On Sundays “brunch” is a (11) ______ of breakfast and lunch, typically beginning at 11:00 am. Students often enjoy a “study break”...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrases that best fits each of the numbered blanks.

Most Americans eat three meals (10) ______ the day: breakfast, lunch, and dinner. Breakfast begins between 7:00 and 8:00am, lunch between 11:00 am and noon, and dinner between 6:00 and 8:00 pm. On Sundays “brunch” is a (11) ______ of breakfast and lunch, typically beginning at 11:00 am. Students often enjoy a “study break” or evening snack around 10:00 or 11:00 pm. Breakfast and lunch tend to be light meals, with only one course. Dinner is the main meal. For breakfast Americans will eat cereal with milk which are often mixed (12) ______ in a bowl, a glass of orange juice, and toasted bread or muffin with jam, butter, or margarine. Another common breakfast meal is scrambled eggs or an omelet with potatoes and breakfast meat (bacon or sausage). People who are on a diet eat just a cup of yogurt. Lunch and dinner are more (13) ______. When eating at a formal dinner, you may be overwhelmed by the number of utensils. How do you (14) ______ the difference between a salad fork, a butter fork, and a dessert fork? Most Americans do not know the answer. But knowing which fork or spoon to use first is simple: use the outermost utensils first and the utensils closest to the plate last

I'm kidding, it's actually 12th grade English

1
7 tháng 7 2019

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrases that best fits each of the numbered blanks.

Most Americans eat three meals (10) _during_____ the day: breakfast, lunch, and dinner. Breakfast begins between 7:00 and 8:00am, lunch between 11:00 am and noon, and dinner between 6:00 and 8:00 pm. On Sundays “brunch” is a (11) _combination_____ of breakfast and lunch, typically beginning at 11:00 am. Students often enjoy a “study break” or evening snack around 10:00 or 11:00 pm. Breakfast and lunch tend to be light meals, with only one course. Dinner is the main meal. For breakfast Americans will eat cereal with milk which are often mixed (12) ___together___ in a bowl, a glass of orange juice, and toasted bread or muffin with jam, butter, or margarine. Another common breakfast meal is scrambled eggs or an omelet with potatoes and breakfast meat (bacon or sausage). People who are on a diet eat just a cup of yogurt. Lunch and dinner are more (13) ___varied___. When eating at a formal dinner, you may be overwhelmed by the number of utensils. How do you (14) __tell____ the difference between a salad fork, a butter fork, and a dessert fork? Most Americans do not know the answer. But knowing which fork or spoon to use first is simple: use the outermost utensils first and the utensils closest to the plate last

10 tháng 12 2020

con mèo trong T.A là cat

25 tháng 3 2020

hello and hi

27 tháng 3 2020

HELLO AND HI