Bài tập 44.5 trang 53 SBT Hóa học 9
Đốt cháy hoàn toàn 3 gam chất hữu cơ A chứa các nguyên tố C, H, O thu được 6,6 gam khí CO2 và 3,6 gam H2O.
a) Hãy xác định công thức phân tử của A, biết khối lượng mol phân tử của A là 60 gam/mol.
b) Viết công thức cấu tạo có thể có của A, biết phân tử A có nhóm -OH.
c) Viết phương trình hoá học của phản ứng giữa A với Na.
Hướng dẫn giải chi tiết bài 44.5
a) Gọi công thức của A là CxHyOz.
Đốt cháy 3 gam A được 6,6 gam CO2 và 3,6 gam H2O.
Vậy mC trong 3 gam A là 6,6/44 x 12 = 1,8g
mH trong 3 gam A là 3,6/18 x 2 = 0,4g
Vậy trong 3 gam A có 3 - 1,8 - 0,4 = 0,8 (gam) oxi.
Ta có quan hệ:
60 gam A → 12x gam C → y gam H → 16z gam O
3 gam A → 1,8 gam C → 0,4 gam H → 0,8 gam O
→ x = 60 x 1,8 /36 = 3 ; y = 60 x 0,4/3 = 8
z = 60 x 0,8/48 = 1
Công thức của A là C3H8O.
b) Công thức cấu tạo của A có thể là:
CH3 - CH2 - CH2 - OH hoặc CH - CH(OH) - CH3
c) Phương trình hoá học của phản ứng giữa A với Na:
2CH3 - CH2 - CH2 - OH + 2Na → 2CH3 - CH2 - CH2 - ONa + H2
2CH3 - CH (CH3) - OH + 2Na → 2CH3 - CH (CH3) - ONa + H2
-- Mod Hóa Học 9 HỌC247
Bài tập SGK khác
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Theo dõi (0) 1 Trả lời -
Tính độ rượu sau khi pha
bởi Đào Lê Hương Quỳnh 24/03/2019
Hoà tan 225ml rượu etylic vào 300ml nước. Tính độ rượu sau khi pha (biết Đr = 0,8g/ml)
Theo dõi (0) 1 Trả lời -
Xác định độ rượu
bởi Thiên Mai 13/06/2019
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 ạTheo dõi (0) 1 Trả lời -
Trình bày quy trình điều chế rượu etylic từ tinh bột
bởi Anh Trần 24/03/2019
trình bày quy trình điều chế rượu etylic từ tinh bột( gao, ngo, khoai, san )và nêu tác hại của việc uống nhiều rượu.
Theo dõi (0) 1 Trả lời -
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
Theo dõi (0) 1 Trả lời -
Tính thể tích khí H2 thu được sau phản ứng
bởi bich thu 24/03/2019
Cho 200ml rượu etylic 92o 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 H2 thu được sau phản ứng
Theo dõi (0) 1 Trả lời -
Tính thể tích của rượu etylic có trong 750ml rượu 45 độ
Theo dõi (0) 2 Trả lời -
Muốn điều chế 920kg rượu etylic cần khối lượng tinh bột là bao nhiêu?
bởi Nguyễn Thủy Tiên 24/03/2019
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%
Theo dõi (0) 1 Trả lời -
Từ 200 ml rượu etylic 90o có thể thêm nước vào để pha chế thành bao nhiêu ml rượu 45o
bởi Tra xanh 14/06/2019
Từ 200 ml rượu etylic 90o có thể thêm nước vào để pha chế thành bao nhiêu ml rượu 45o
( Mấy bạn giải ra giúp mink nhak)
Theo dõi (0) 1 Trả lời