Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Bài 1:
\(PTHH:2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ n_{NaOH}=\dfrac{6}{40}=0,15\left(mol\right)\\ \Rightarrow n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}\cdot0,15=0,075\left(mol\right)\\ \Rightarrow m=m_{H_2SO_4}=0,075\cdot98=7,35\left(g\right)\\ n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ \Rightarrow n_{H_2}=0,2\left(mol\right)\\ \Rightarrow V=V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\)
\(n_{Fe} =\dfrac{11,2}{56} = 0,2(mol)\\ \)
Fe + 2HCl → FeCl2 + H2
0,2.....0,4.........0,2........0,2..............(mol)
Vậy :
V = 0,2.22,4 = 4,48(lít)
\(m_{FeCl_2} = 0,2.127=25,4(gam)\)
\(m_{HCl} = 0,4.36,5 = 14,6(gam)\)
PTHH: Fe+2HCl → FeCl2+H2
a, nFe=m:M=11,2:56=0,2 mol
Theo PTHH, nFe=nH2=0,2 mol
VH2=n.22,4=0,2.22,4=4,48 lít
b, Theo PTHH, nFeCl2=nFe=0,2
mFeCl2=n.M=0,2.127=25,4 g
c,
Theo PTHH, nHCl=2nFe=0,4 mol
mHCl=n.M=0,4.36,5=14,6 g
PTHH: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)=n_{Fe}\)
\(\Rightarrow n_{Fe_2O_3}=0,15\left(mol\right)\) \(\Rightarrow m_{Fe_2O_3}=x=0,15\cdot160=24\left(g\right)\)
Đặt \(\left\{{}\begin{matrix}n_{Fe}=a\left(mol\right)\\n_{Na}=b\left(mol\right)\end{matrix}\right.\)
PTHH:
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
a--------------------------->a
\(2Na+2HCl\rightarrow2NaCl+H_2\)
b---------------------------->0,5b
Ta có: \(m_M=\dfrac{1}{2}.\left(m_{Fe}+m_{Na}\right)=\dfrac{1}{2}.\left(56a+23b\right)=28a+11,5b\left(g\right)\)
PTHH: \(M+2HCl\rightarrow MCl_2+H_2\)
(a+0,5b)<----------------(a+0,5b)
\(\Rightarrow M_M=\dfrac{28a+11,5b}{a+0,5b}\\ \Rightarrow\dfrac{28a}{a}>M_M>\dfrac{11,5a}{0,5a}\\ \Leftrightarrow28>M_M>23\)
Vậy M là Magie (Mg)
a, nFe = 16,8/56 = 0,3 (mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
Mol: 0,3 ---> 0,6 ---> 0,3 ---> 0,3
VH2 = 0,3 . 22,4 = 6,72 (l)
b, nCuO = 20/80 = 0,25 (mol)
PTHH: CuO + H2 -> (t°) Cu + H2O
LTL: 0,25 < 0,3 => H2 dư
Gọi nCuO (p/ư) = a (mol)
=> nCu (sinh ra) = a (mol)
Ta có: 80(0,25 - a) + 64a = 16,4
=> a = 0,225 (mol)
H = 0,225/0,25 = 90%
PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Ta có: \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)
\(n_{H_2}=\dfrac{16,8}{22,4}=0,75\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,75}{3}\), ta được H2 dư.
Theo PT: \(n_{Fe\left(LT\right)}=2n_{Fe_2O_3}=0,4\left(mol\right)\)
Mà: H% = 80%
\(\Rightarrow n_{Fe\left(TT\right)}=0,4.80\%=0,32\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Theo PT: \(n_{H_2}=n_{Fe}=0,32\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,32.22,4=7,168\left(l\right)\)
Bạn tham khảo nhé!