rfhiunikuji2

2 năm trước

AD làm kiểu j v Câu trả lời linh tinh báo cáo AD chả làm gì cả vẫn để ở đó hoài Cho một lượng kẽm, dư tác dụng với 100ml dung dịch axit clohiđric phản ứng kết tủa thu được 4,36l khi ở điều kiện tiêu chuẩn a:Viết phương trình hóa học sảy ra b:Tính nồng độ mol của dung dịch HCL c:Tính khối lượng kẽm đã tham gia phản ứng

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giangnth

2 năm trước

Đáp án:

Giải thích các bước giải:

nguyentransondhy

2 năm trước

Đáp án:

b) 3,9M

c) 12,675 gam

Giải thích các bước giải:

Thể tích khí là 3,36 hay 4,36 em ???

a) Phản ứng:

Zn + 2HCl -> ZnCl2 + H2

Ta có: nH2=4,36/22,4=0,195 mol

Theo ptpu: nHCl=2nH2=0,39 mol;

-> CM HCl=nHCl/V HCl=0,39/0,1=3,9M

c) Theo ptpu: nZn=nH2=0,195 mol -> mZn=0,195.65=12,675 gam

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1) Nước đá khớp được làm từ gì ? Tại sao nó có thể tạo hơi lạnh được như đá khô ?
2) Vì sao khi mở bình nước ngọt có ga lại có nhiều bọt khí thoát ra ?
3) Tại sao CO2 được dùng để dập tắt các đám cháy ?
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if you don't wear a helmet , you can't ride your bike => Unless

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Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.