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Một lít rượu 92 độ cân nặng bao nhiêu g biết rằng khối lượng riêng là 0,8 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Trả lời (1)
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Độ rượu\(=\dfrac{V_{rượu}.100}{V_{ddrượu}}\) \(\Rightarrow\)\(V_{rượu}=\dfrac{độrượu.V_{rượu}}{100}\)=\(\dfrac{92.1}{100}\)=0,92 (l)
\(D=\dfrac{m}{V}\Rightarrow m=D.V\)=0,8 . 0,92 = 0,736 (g)
bởi Nguyễn Duy Thông 24/03/2019Like (0) Báo cáo sai phạm
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Ngâm sắt dư trong 200 ml dung dịch cuso4 0,5M. Sau khi phản ứng kết thúc lọc được chất rắn A và dung dịch B
a) Cho A tác dụng với dung dịch hcl dư. Tính khối lượng chất rắn còn lại sau phản ứng
b)Tính thể tích dung dịch naoh 1M vừa đủ để kết tủa hoàn toàn dung dịch B. Lọc kết tủa đem nung ngoài không khí đến khối lượng không đổi, thu được bao nhiêu gam chất rắn
12/12/2022 | 0 Trả lời
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So sánh giữa gang và thép:
1. Thành phần, cấu tạo
2. Nguyên liệu
3. Nguyên tắc sản xuất
4. Các phản ứng xảy ra trong quá trình sản xuất
13/12/2022 | 0 Trả lời
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Cho a gam hỗn hợp kim loại Fe và Cu tác dụng hoàn toàn với 200g dung dịch HCl thu được dung dịch A, 11,2 lít khí H2 ở đktc và 5,6 gam chất rắn còn lại sau phản ứng.
a) Tính khối lượng hỗn hợp kim loại bạn đầu
b) Tính nồng độ phần trăm của dung dịch HCl đã dùng là bao nhiêu
21/12/2022 | 0 Trả lời
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giúp mình với ạ
Ở các lò nung vôi vôi sống (CaO) được sản xuất từ đá vôi theo phương trình hóa học: CaCO3 -> CaO + CO2. Cần dùng bao nhiêu gam CaCO3 để điều chế đc 11,2 gam CaO?
29/12/2022 | 0 Trả lời
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Cho 10,8g kim loại M (lll) tác dụng với khí clo dư thu đc 53,4g muối clorua
a, xác định kim loại
b, cho 13,5g kim loại trên tan hoàn toàn trong dd HCl 15% tính khối lượng dd tham gia phản ứng
02/01/2023 | 0 Trả lời
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X được cấu tạo bởi 2 nguyên là C và H. Tỉ lệ về số mH : mC = 1 : 4. Biết rằng số nguyên tử trong X bằng số nguyên tử trong hợp chất C2H4. Tìm công thức hóa học của X?
07/02/2023 | 0 Trả lời
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: Cho 3,36 lít (đktc) hỗn hợp khí CH4 và C2H4 đi qua bình chứa dung dịch nước brom dư. Sau phản ứng thấy khối lượng bình tăng 1,4 gam. Tính thành phần phần trăm theo thể tích metan trong hỗn hợp
11/03/2023 | 0 Trả lời
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Đốt cháy hoàn toàn 1mol khí axetilen thì cần bao nhiêu lít không khí
12/03/2023 | 0 Trả lời
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A. Chất lỏng, không màu, nhẹ hơn nước, tan vô hạn trong nước, hòa tan được nhiều chất như iot, benzen, …
B. Chất lỏng, màu hồng, nhẹ hơn nước, tan vô hạn trong nước, hòa tan được nhiều chất như iot, benzen, …
C. Chất lỏng, không màu, không tan trong nước, hòa tan được nhiều chất như iot, benzen, …
D. Chất lỏng, không màu, nặng hơn nước, tan vô hạn trong nước, hòa tan được nhiều chất như iot, benzen, …
16/03/2023 | 1 Trả lời
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A. CH2-CH3-OH
B. CH3-O-CH3
C. CH2-CH2-(OH)2
D. CH3-CH2-OH
17/03/2023 | 1 Trả lời
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A. 8,84 lít
B. 9,60 lít
C. 10,08 lít
D. 13,44 lít
17/03/2023 | 1 Trả lời
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A. Tác dụng với axit axetic
B. Tác dụng với kim loại mạnh như K, Na, …
C. Phản ứng cháy
D. Cả A, B, C đều đúng
16/03/2023 | 1 Trả lời
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A. Số ml rượu etylic có trong 100 ml hỗn hợp rượu với nước
B. Số ml nước có trong 100 ml hỗn hợp rượu với nước
C. Số gam rượu etylic có trong 100 ml hỗn hợp rượu với nước
D. Số gam nước có trong 100 gam hỗn hợp rượu với nước
16/03/2023 | 1 Trả lời
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A. 20 gam
B. 30 gam
C. 40 gam
D. 60 gam
17/03/2023 | 1 Trả lời
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A. Nhóm –CH3
B. Nhóm CH3-CH2-
C. Nhóm –OH
D. Cả phân tử
16/03/2023 | 1 Trả lời
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A. Làm nguyên liệu sản xuất axit axetic, dược phẩm, cao su tổng hợp, các loại đồ uống
B. Làm nhiên liệu cho động cơ, nhiên liệu cho đèn cồn trong phòng thí nghiệm
C. Làm dung môi pha vecni, nước hoa
D. Cả A, B, C đều đúng
16/03/2023 | 1 Trả lời
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A. 16,8 lít
B. 20,2 lít
C. 17,8 lít
D. 18,9 lít
17/03/2023 | 1 Trả lời
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A. 35 ml rượu nguyên chất với 65 ml nước
B. 65 ml rượu etylic nguyên chất hòa với 35 ml nước
C. 100 ml rượu etylic nguyên chất có 65 ml nước
D. 100 ml nước hòa với có 65 ml rượu nguyên chất
16/03/2023 | 1 Trả lời
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A. Tinh bột
B. Glucozơ
C. Etilen
D. Cả A, B, C đều đúng
16/03/2023 | 2 Trả lời
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Cho các phát biểu sau:
(1) Trong phân tử rượu etylic có một nguyên tử hiđro không liên kết với nguyên tử cacbon mà liên kết với nguyên tử oxi, tạo ra nhóm –OH.
(2) Rượu etylic tác dụng với axit axetic thu được este.
(3) Rượu etylic cháy với ngọn lửa màu xanh, tỏa nhiều nhiệt.
(4) Nhiệt độ sôi của rượu etylic cao hơn nhiệt độ sôi của nước.
Số phát biểu đúng là
A. 1
B. 2
C. 3
D. 4
16/03/2023 | 1 Trả lời