chuyên gia giúp e chi tiết giùm Xà phòng hóa hoàn toàn 1,99 gam hỗn hợp 2 este = dd NaOH thu dc 2,05 gam muối của 1 axit cácboxylic và 0,94 gam hh 2 ancol là đồng đẳng kế tiếp nhau .CT của 2 este đó là; _____________________________________ ĐUn 12 gam axit axetic vs 13,8 gam etanol (Xt: H2SO4 đặc) đến khi phản ứng đạt trạng thái cân = ,thu dc 11 gam este .Hiệu suất của phản ứng este hóa là???????????????????????????% _____________________________________________ Hỗn hợp X gồm axit HCOOH và CH3COOH (1:1) Lấy 5,3 gam hh X tác dụng vs 5,75 gam C2H5OH (xt:H2SO4 đặc) thu dc m gam hỗn hợp este (hiệu suất các p'ứng este hóa = 80%) .Giá trị m là

Digi quả tim nhé ^^ Vẽ giống thật vào ạ Dạo này mọi người ít đăng vậy, toàn Cali gì đó :v

viết đoạn văn từ 4-6 câu bày tỏ cảm nghĩ của em khi quan sát cây hoa phượng

Giúp em mới ạ, ai đúng và nhanh nhất e hứa sẽ vote ctlhn 😍😍😍😍😍😍😍

1) Tick (V) the best answer. 1. Laura ________________ a student. A. is B. am C. are2. She _____________Music because she wants to singA. like B. likes C. doesn’t like 3. Tom was born ___________September 15th 1998 A. in B. on C.at 4. My mother is a _____________. She works at Bach Mai hospiter A. Teacher B. farmer C. docter 5. My friend, Lisa, is __________ Australia. She is Australian A. on B. from C. at 2) Reoder to make sentences.1. Where/ from/ is/ Alan/?/ ___________________________________________ 2. old/ is/ mother/ your/ How/ ?__________________________________________ 3. student/ Kim lien Primary School/ you/ Are/ at/ a/ ?__________________________________________ 4. father/ Where/ work/ your/ does/ ? / ___________________________________________ 5. born/ 1995/ was/ on/ I/ January 5th/ ./ ___________________________________________ 3) Tick the correct sentence. 1. A. He’s from Australian B. He’s from Australia 2. A. How many people is there in your family ? B. How many people are there in your family ? 3. A. What subject do you like ? B. What do you like subject? 4. A. When were you born ? B. How old were you born ? 5. A. Where does he lives ? B. Where does he live ? 4.)Complete the dialogue.Tom: Hi. My _______Tom. I’m ________________America.Alan: Hi, Tom. I’m Alan. Nice to meet you.Tom: Nice to meet you, ___________. ___________ are you from, Alan.Alan: I’m from Singapore. Are you a student at this school ?Tom: No, I am __________________. My father works at this school. He is ______________teacher. 5. Read the passage and tick (v) the best answer. There are four people in my family: my parents, my brother and me. My father is aworker. He works in the factory. My mother is a nurse. She works in a hospital. Mybrother is a student. He is sixteen years old. He goes to Nguyen Trai High School. I am astudent, too. I go to Thang Long Primary School. 1. How many people are there in her family ? A. There are five. B. There are four. C. There are three. 2. What does her father do ? A. He’s a worker. B. He’s a teacher. C. He’s a nurse. 3. Where does her mother work ? A. She works in a factory. B. She works in a school. C. She works in a hospital. 4. How old is her brother ? A. 14 B. 15 C. 15 5. What school does che go to ? A. Nguyen Trai High School B. Thang Long Primry School C. Nguyen Trai Primay School

both is fine là gì vậy ạ ? Đừng dịch theo sức khỏe ạ =)

Giúp mình làm mấy bài này vs , cảm ơn ạ!

Chọn từ có phần gạch chân được phát âm khác với những từ khác. 2.evening seven tell directory. (phần gạch chân là e đầu tiên của mỗi chữ) 3.soon excuse sure sorry (Phần gạch chân là s) Tìm lỗi sai là sửa. 1.Don't worry.You will have lot of new friends. 2.I live with my parents at Hue city. 3.How old wil she be in her next birthday? Điền vào mỗi chỗ trống với một giới từ thích hợp. 1.Is Mr James...............work this week?No,he's .........holiday. 2.The meeting will last ........7a.m........5p.m. 3.What's.....TV tonight?

cho a,b,c thuộc R cmr: (a+b+c)^2 = a^2 + b^2 + c^2v + 2ab + 2bc + 2ca

vẽ anime vui vui nhó NL: kím NY