Cho 25,8 gam hỗn hợp X gồm HCOOC₂H₅ và H₂NC₃H₅(COOH)₂ tác dụng vừa đủ với 350 ml dung dịch NaOH 1M đun nóng. Đốt cháy hoàn toàn 25,8 gam hỗn hợp X trên rồi dẫn toàn bộ sản phẩm cháy qua bình đựng dung dịch nước vồi trong dư thì thấy xuất hiện ra gam kết tủa. Giá trị của m là:

A. 47,5 gam

B. 87,5gam

C. 105,5 gam

D. 95,0gam

Bored! Thanks, and you

I have many friends but my best friend is Ha. She is eleven years old and she is in grade six. She not tall but she is thin . Her hair is long black. She has an oval face. Her eyes are big round, her lips are full and her nose is straight. She always smiles with her small white teeth.

Ha is kind and friendly and she is a good student in my class about Literature so she often helps our classmate about their Literature exercise. Her hobby is listening to music . In her free time, she often listening to music or studies in her room but sometimes she goes out with me.In the future, she wants to be a Literature teacher and I believe in her. I hope that our friendship will last forever.

Chất phản ứng với dung dịch NaOH tạo ra CH₃COONa và C₂H₅OH là

A. CH₃COOCH₃

B. C₂H₅COOH

C. HCOOC₂H₅

D. CH₃COOC₂H₅

Nêu cách sử dụng much/many, little/few