Quynhnhu820

2 năm trước

cho 10g zn và cu tác dụng với dung dịch HCL sinh ra 2,24 lít khí H2 ở điều kiện tiêu chuẩn a) viết các phương trình hóa học b) tính khối lượng HCL đã phản ứng c) tính thành phần % của mỗi chất trong hỗn hợp ban đầu * Điều chế khí hidro,clo và lưu huỳnh đi oxit

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Ayanokoji Kiyotaka

2 năm trước

Đáp án:

Giải thích các bước giải:

a, Zn + 2HCl --> ZnCl2 + H2

Cu + HCl --> ko phản ứng

b,n H2 = 2,24/22,4= 0,1(mol)

--> mZn = 0,1.65= 6,5(g)--> %Zn = 6,5/10 .100=65%--> %Cu = 100-65= 35%

Ngô Thảo

2 năm trước

Cu ko pứ vs HCl nên khí H2 sinh ra là của Zn pứ

nH2 = 2,24/22,4= 0,1 (mol)

a) Zn+2HCl ---> ZnCl2 +H2

0,1 0,2 0,1

b) mHCl= 0,2.36,5 =7,3 (g)

c) %Zn= 0,1.65/10 .100% =65%

%Cu= 100%- 36,5%= 35%

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