gup em voi nek
CAU 1: cho 6(g) Ca vao 73(g) dd HCl 10%, sau phan ung thay thoat ra V lit kkhi o dktc
a, tim V
b, neu dan luong khi noi tren di qua ong dung n(g) Cu co nung nong , ket thuc phan ung co 10(g) chat ran con lai . tim m?
( giup em voi anh chi oi )
a/ \(Ca+2HCl\left(0,2\right)\rightarrow CaCl_2+H_2\left(0,1\right)\)
\(n_{Ca}=\dfrac{6}{40}=0,15\left(mol\right)\)
\(m_{HCl}=73.10\%=7,3\left(g\right)\)
\(\Rightarrow n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)
Vì \(\dfrac{n_{Ca}}{1}=0,15>\dfrac{n_{HCl}}{2}=0,1\) nên Ca phản ứng dư, HCl hết
\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b/ \(CuO\left(0,1\right)+H_2\left(0,1\right)\rightarrow Cu\left(0,1\right)+H_2O\)
\(\Rightarrow m_{CuO\left(pứ\right)}=0,1.80=8\left(g\right)\)
\(\Rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)
Khối lượng chất rắn ban đầu là: \(m=10+8-6,4=11,6\left(g\right)\)
thank you