Cái này là gv Hóa mình chỉ mình 

\(m_{NaCl}=\dfrac{5,85\%.200}{100\%}=11,7\left(g\right)\)
\(n_{NaCl}=\dfrac{11,7}{58,5}=0,2\left(mol\right)\)

Số mol Zn chuyển qua thì số mol HCl phải là 0,2 mol chứ bạn

200ml = 0,2l
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,1.....0,2                        0,1   (mol)
a) \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(C_{M_{HCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
b) \(V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\)

\(\left(11-6\sqrt{2}\right)^2=11^2-2.11.6\sqrt{2}+\left(6\sqrt{2}\right)^2=121-132\sqrt{2}+72=193-132\sqrt{2}=VT\)
Vậy biểu thức đã được chứng minh

Ở 25^oC, cứ 100 gam nước có thể hòa tan được 36 gam NaCl để tạo thành dung dịch bão hòa.

a) \(\widehat{yAZ}=\widehat{xAt}=42^o\) (2 góc đối đỉnh)
b) \(\widehat{xAZ}=180^o-\widehat{xAt}=180^o-42^o=138^o\) ( 2 góc kề bù )

Câu 7 ko có 'so' nha mình ghi dư ấy

1. I was late for the meeting because of the heavy traffic .
2. He is very intelligent due to the reason that he reads a lot of  books.
3. The car is too expensive so I can't buy it.
4. I broke my mother's favorite vase so she became very angry.
5. There are too many tall building, so we can't see the moon.
6. Since he was lazy, he fell the exam.
7. Because the air is polluted, so many people have breathing problems.
8.They never go out, so they don't know anything outside.
9. Because their parents don't allow them waste money, the children have a lot of saving money.
10. The student's parents always understand them so they feel happy.