Bài tập 44.5 trang 53 SBT Hóa học 9

để đoạn mía lâu ngày trong không khí ở đầu đoạn mía có mùi rượu etylic

1. Có 100 ml rượu etylic 75 độ và nước cất đủ dùng , cùng dụng cụ đo thể tích cần thiết , có thể pha được bao nhiêu ml rượu etylic 30 độ ? hãy trình bày cách pha .

2. khi đốt cháy hoàn toàn 4,5 ml rượu etylic , dẫn sản phẩm cháy đi qua đ nước vôi trong dư , thu được 4,4 gam kết tủa trắng . tính độ rượu của rượu đem dùng , biết D_rượu = 0,8 g/ml ; D_nước = 1 g/ml.

vì sao thường ngâm chuối , một số vị thuốc bắc vào rượu? Ngâm để làm gì?

hòa tan hoàn toàn 9,2 gam Natri vào rượu Etylic thu được V lít khí. Hãy tính V.

Cho 10ml rượu etylic 90⁰ tác dụng hết với Na . Tính thể tích khí bay ra ( ở đktc ) . Biết khối lượng riêng của rượu etylic nguyên chất là 0,8g /ml , của nước là 1g / ml

HELP ME !!!!

bài 1: Trong cuộc sống , ngoài việc sử dụng cồn làm nhiên liệu , còn có thể dùng nó để sát trùng học rửa các vết thương vì cồn có tác dụng diệt khuẩn .Thực tế người ta dùng cồn 75 độ để sát trùng là tốt nhất mà không dùng cồn 90 độ hoặc 96 độ . Giải thích khả năng diệt khuẩn của cồn 75 độ , tại sao không dùng cồn 90 độ hay 96 độ.

a)làm thế nào để phát hiện lượng nước nhỏ có lẫn trong rượu etylic . nêu phương pháp làm khan rượu etylic có lẫn 1 lượng nhỏ nước ?

b) làm thế nào để có rượu 70 độ từ rượu khan ?

Một hỗn hợp gồm hai rượu liên tiếp nhau trong dãy đồng đẳng của rượu etylic. Lấy 5,3 gam hỗn hợp rượu trên tác dụng với Na, rồi dẫn sản phẩm khí thu được đi qua đồng(II) oxit nung nóng thì thu được 0,9 gam nước . Nếu đốt cháy 1,06 gam hỗn hợp trên, khí thoát ra cho vào bình chứa dung dịch Ca(OH)2 dư thì thu được 5 gam kết tủa.
a. Xác định công thức phân tử , viết công thức cấu tạo của hai rượu
b. tính thành phần phần trăm về khối lượng của mỗi rượu có trong hỗn hợp

dung dịch A là hỗn hợp rượu etylic vad h20 cho 20,2 g A tác dụng hết với với natri thì thu được 5,6 ;ít H2 ( đktc ) . tính đọ của rượu biết d= 0,8 n h20 = 1

Giúp nha

Hòa tan 30 ml rượu etylic nguyên chất vào 90 ml nước cất thì được dd có độ rượu bao nhiêu ?

ai biết thì giúp mình nhé, cảm ơn nhiều !

Mình đang cần gấp nhé!!!!!!

Một lít rượu 92 độ cân nặng bao nhiêu g biết rằng khối lượng riêng là 0,8 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ttps:https://hoc247.net/image/faq/data2/579928_.https://hoc247.net/image/faq/data2/579928_.hoc247.nethttps://hoc247.net/image/faq/data2/579928_.imagehttps://hoc247.net/image/faq/data2/579928_.faqhttps://hoc247.net/image/faq/data2/579928_.data2https://hoc247.net/image/faq/data2/579928_.976518_.196551_.710107_.185200_.https:https:https:https:https://hoc247.net/image/faq/data2/579928_.https://hoc247.net/ima

Hoà tan 225ml rượu etylic vào 300ml nước. Tính độ rượu sau khi pha (biết Đr = 0,8g/ml)

Cho 20,2g rượu etylic tác dụng với Na lấy dư thấy thoát ra 5,6 lít khí hidro (đktc)
a) Xác định độ rượu
b) Nếu dùng rượu etylic 40⁰ cho tác dụng với Na thì cần bao nhiêu gam C₂H₅OH để thu được thể tích H₂ nói trên ?
Mọi người giúp em với ạ ^^ chi tiết được thì càng tốt ạ

trình bày quy trình điều chế rượu etylic từ tinh bột( gao, ngo, khoai, san )và nêu tác hại của việc uống nhiều rượu.

tại sao bỗng rượu để bỗng rượu trong không khí thì lại bị chua và khi dùng bỗng rượu để nấu canh thì lại thấy có mùi thơm

Cho 200ml rượu etylic 92^{o tác dụng với Na. Khối lượng riêng của rượu nguyên chất là 0.8 gamml, khối lượng riêng của nước là 1 gamml. Tính thể tích khí H_{2 thu được sau phản ứng}}

Tính thể tích của rượu etylic có trong 750ml rượu 45 độ

Từ tinh bột có thể sản xuất rượu etylic theo sơ đồ: -(C₆H₁₀O₅)-_n-->C₂H₅OH+CO₂ Muốn điều chế 920kg rượu etylic cần khối lượng tinh bột là bao nhiêu ,biết hiệu suất của quá trình là 50%

Từ 200 ml rượu etylic 90^o có thể thêm nước vào để pha chế thành bao nhiêu ml rượu 45^o

( Mấy bạn giải ra giúp mink nhak)