Hợp chất hữu cơ Y có tỉ lệ khối lượng mC : mH : mO : mN = 14,4...">
K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

1 tháng 2 2023

Ta có: \(n_{Y\left(29,12\left(g\right)\right)}=n_{CO_2}=\dfrac{14,08}{44}=0,32\left(mol\right)\)

\(\Rightarrow M_Y=\dfrac{29,12}{0,32}=91\left(g/mol\right)\)

Gọi: CTPT của Y là CxHyOzNt.\(\Rightarrow x:y:z:t=\dfrac{14,4}{12}:\dfrac{3,6}{1}:\dfrac{12,8}{16}:\dfrac{5,6}{14}=1,2:3,6:0,8:0,4=3:9:2:1\)

→ Y có CTĐGN là (C3H9O2N)n (n nguyên dương)

Có: \(n=\dfrac{91}{12.3+9+16.2+14}=1\left(tm\right)\)

Vậy: CTPT của Y là C3H9O2N.

I.Read and match :                                                                         1.     Where will you be this weekend?                   A . I usually do morning exercise2.     What did you do at the party?                         B.  I was at the seaside3.     What will you do at Ha Long Bay?                C.   I think I’ll be at home...
Đọc tiếp

I.Read and match :                                                                        

1.     Where will you be this weekend?                   A . I usually do morning exercise

2.     What did you do at the party?                         B.  I was at the seaside

3.     What will you do at Ha Long Bay?                C.   I think I’ll be at home .

4.     Where were you last summer ?                       D. We chatted with friends                     

5.     What do you do in the moring ?                      E. I think I’ll explore the caves

II. Read and complete :

       Flowers              different             went                 holidays                 were

Linda and Tom(1)……… on their holidays. They  went to (2)…………places. Linda(3)…..... to the  Festival of (4)……...in Da Lat. Tom  joined a  sports festival. They enjoyed their(5)………….. very much.

III. Read and write T(true ) or F( false ) :

My name is Nam. It was my birthday last Sunday. I invited some of my classmates to the party. They gave me presents like comic books, robots and a teddy bear. We ate cakes, sweets, fruit and ice cream. We drank fruit juice. We sang English and Vietnamese songs. We danced, too. Phong played the guitar and Linda played the piano. The party ended at 7 p.m. We enjoyed it very much.

1.     Nam’s birthday was last Saturday .

2.     He invited some of his classmates to the party.

3.     His parents gave him presents like comic books, robots

4.     They ate cakes, sweets, fruit and ice cream

5.     They only sang Vietnamese songs

6.     Nam played the guitar

7.     Linda played the piano

8.     They enjoyed the party very much

IV. Read and answer the questions :

Hi. My name is Nam. Every morning, I get up early. I do morning exercise, have breakfast and then go to school. After school, I  usually do homework with my classmates. Then I often go to the sports centre and  play football. In the evening, I sometimes watch TV. I  like watching films after dinner.

1.     What’s his name ?..................................................................

2.     Does he get up late ?....................................................................

3.     What does he do in the moring ?.........................................................

4.     What does he do after school ?.....................................................................

5.     Does he usually do homework with his friends ?..............................................

6.     Does he often play football ?.............................................

7.     What does he sometimes do in the evening ?...................................................

8,What does he like doing after dinner

14
6 tháng 4 2020

1. she is listening to music now

6 tháng 4 2020

Tìm và sửa lỗi sai

1.She are listening to music now.

» She is listening to music now

2.He was born on October 1th 2008.

» He were born on October 1th 2008.

3.Was you at home yesterday?

 » Was you stay at home yesterday.

4.My brother  have many toy cars .

 » My brother has many toy cars.

5.He wants to be a artist.

 » He wants to be an artist.

6.How often does your friends play football after school? 

» How often do your friends play football after school?

7.Their son is seven year old.

» Their son are seven year old.

8.My names  are Loan  and Huong.

» My name  are Loan  and Huong.

9.Trung and Tuan don't eating fish at lunch.

» Trung and Tuan don't eat fish at lunch.                                                                   10.your 10.parents are watching TV in the livingroom now ?

»  Do your parents are watching TV in the livingroom now?

# Học tốt

I.Read and match :                                                                         1.     Where will you be this weekend?                   A . I usually do morning exercise2.     What did you do at the party?                         B.  I was at the seaside3.     What will you do at Ha Long Bay?                C.   I think I’ll be at home...
Đọc tiếp

I.Read and match :                                                                        

1.     Where will you be this weekend?                   A . I usually do morning exercise

2.     What did you do at the party?                         B.  I was at the seaside

3.     What will you do at Ha Long Bay?                C.   I think I’ll be at home .

4.     Where were you last summer ?                       D. We chatted with friends                     

5.     What do you do in the moring ?                      E. I think I’ll explore the caves

II. Read and complete :

       Flowers              different             went                 holidays                 were

Linda and Tom(1)……… on their holidays. They  went to (2)…………places. Linda(3)…..... to the  Festival of (4)……...in Da Lat. Tom  joined a  sports festival. They enjoyed their(5)………….. very much.

III. Read and write T(true ) or F( false ) :

My name is Nam. It was my birthday last Sunday. I invited some of my classmates to the party. They gave me presents like comic books, robots and a teddy bear. We ate cakes, sweets, fruit and ice cream. We drank fruit juice. We sang English and Vietnamese songs. We danced, too. Phong played the guitar and Linda played the piano. The party ended at 7 p.m. We enjoyed it very much.

1.     Nam’s birthday was last Saturday .

2.     He invited some of his classmates to the party.

3.     His parents gave him presents like comic books, robots

4.     They ate cakes, sweets, fruit and ice cream

5.     They only sang Vietnamese songs

6.     Nam played the guitar

7.     Linda played the piano

8.     They enjoyed the party very much

IV. Read and answer the questions :

Hi. My name is Nam. Every morning, I get up early. I do morning exercise, have breakfast and then go to school. After school, I  usually do homework with my classmates. Then I often go to the sports centre and  play football. In the evening, I sometimes watch TV. I  like watching films after dinner.

1.     What’s his name ?..................................................................

2.     Does he get up late ?....................................................................

3.     What does he do in the moring ?.........................................................

4.     What does he do after school ?.....................................................................

5.     Does he usually do homework with his friends ?..............................................

6.     Does he often play football ?.............................................

7.     What does he sometimes do in the evening ?...................................................

                              8.   What does he like doing after dinner
2

                                     BÀI GIẢI 

  Vì khi chuyển dấu phẩy ở số A sang bên trái 1 hàng ta 

 được số B nên số A gấp 10 lần số B . Nếu chuyển dấu phẩy ở số A 

 sang bên phải 1 hàng ta được số C nên số C gấp 100 lần số B .

             Ta có :

        A + B + C = 100 x B + B + B x 10 = 221,778

        A  + B + C =    111 x B    = 221,778

=>    B = 221,778 : 111 = 1,998

=> Số A là : 

              1,998 x 10 = 19,98

         Vậy số A là 19,98

  ~ CHÚC BẠN HOK TỐT ! ~

         

7 tháng 4 2020

Trl :

Bạn kia làm đúng rồi nhé !

Học tốt nhé bạn @

 Given the following sentences:(1) Vì thức ăn trong hồ khan hiếm, cả đàn cá phải nhịn ăn mấy ngày liền Cá mẹ đã nghĩa ra một cách liều lĩnh.(2) Đàn kiến tưởng cá đã chết kéo cả đàn đến cắn Cá mẹ.(3) Nó nhảy phóc lên bờ, nằm yên giả vờ chết.(4) Cá Quả mẹ và đàn con rất đông sống trong một cái hồ lớn, hàng ngày, Cá mẹ dẫn đàn con đi quanh hồ kiếm ăn.(5) Khi hàng trăm con kiến đã...
Đọc tiếp

 

Given the following sentences:
(1) Vì thức ăn trong hồ khan hiếm, cả đàn cá phải nhịn ăn mấy ngày liền Cá mẹ đã nghĩa ra một cách liều lĩnh.
(2) Đàn kiến tưởng cá đã chết kéo cả đàn đến cắn Cá mẹ.
(3) Nó nhảy phóc lên bờ, nằm yên giả vờ chết.
(4) Cá Quả mẹ và đàn con rất đông sống trong một cái hồ lớn, hàng ngày, Cá mẹ dẫn đàn con đi quanh hồ kiếm ăn.
(5) Khi hàng trăm con kiến đã leo lên mình, Cá mẹ liền nhảy xuống nước chỗ đàn con đang đợi.
(6) Đàn kiến nổi lềnh bềnh, những chú cá con thi nhau ăn ngon lành.
(7) Cá Quả mẹ mình mẩy bị Kiến cắn đau nhừ nhưng nó vô cùng sung sướng nhìn đàn con được một bữa no nê. 
Select the correct sequence to make a complete story.
 
A. (1) - (4) - (5) - (3) - (2) – (6) – (7)
B. (4) - (1) - (3) - (2) - (5) - (6) - (7)
C. (3) - (5) - (2) - (1) - (4) - (6) - (7)
D. (3) - (5) - (2) - (4) - (1) - (6) - (7)

 

 

0
29 tháng 9 2020

Set the number of oranges to a, the number of apples to b .

Know that a = 3/2 b, a + b = 15

=> a = 15: (3 + 2) x 3 = 9

<=> b = 15 - 9 = 6

So the number of apples is 9, the orange number is 6 .

2 tháng 10 2020

Apples:     +----+----+----+   

Oranges:  +----+----+         

The number of apples is:

15 : (3+2) x 3 = 9 ( apples )

The number of oranges is:

15 - 9 = 6 ( oranges )

Ans: oranges: 6

         apples: 9

I have a best friend named Linh, we have been together since we were just little kids. She has beautiful bright skin and brown eyes. We have a lot of things in common, such as we love the same band, food and books. She and I even share the same name, and it is a small surprise for anyone who has talked to us. Linh is not my classmate, but we always help each other with the homework and school projects. We spend every minute in our break time to talk about all the things that happen in class, and people usually ask what can even makes us laugh that hard. Sometimes I think it is we have been best mates since forever, and I hope that we will be happy this for a very long time.

16 tháng 3 2022

Thể tích bể là :

4 x 3,6 x 2,4 = 34,56 ( m3 )

Thể tích nước trong bể là :

34,56 x 70% = 24,192 ( m3 ) = 24192 = 24 192 lít

16 tháng 3 2022

là 24,192

21 tháng 6 2021

a bamboo nghĩa là một cây tre nha

chúc bạn học tốt

21 tháng 6 2021

a bamboo là một cây tre nha

21 tháng 5 2021

Dung dịch là j?

A.Dung dịch là hỗn hợp của chất lỏng với chất hoà tan trong nó.

B.Dung dịch là hỗn hợp của chất lỏng  với chất rắn đc hòa tan trong đó và phân bố đều

C.Cả hai trường hợp trên

 

I, mk ko bik, sr nha :)

II, 1. healthy       2. once       3. toothpaste       4. bigger

3 tháng 5 2020

1. Often -> long. 

2. 1) healthy

2) once

3) toothpaste

4) bigger

hok tốt :)

26 tháng 4 2021

1. 

Bãi Sao - Phú Quốc, Kiên Giang

Mũi Né - Bình Thuận

Nha Trang - Khánh Hòa

Mỹ Khê - Đà Nẵng

Cửa Đại - Hội An, Quảng Nam

Để bảo vệ các bãi biển, ta cần:
- Không xả rác, xả nước thải ra sông và biển khi chưa được xử lý.
- Nghiêm ngặt trong giao thông thủy, tránh tai nạn và tràn dầu.
- Tăng cường bảo vệ các mỏ dầu khí trên biển
- Khai thác thủy hải sản hợp lý
- Khai thác du lịch biển đảo hợp lý
- Có những chính sách, điều lệ bảo vệ biển đảo
- Vân động mọi người có ý thức bảo vệ môi trường biển