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a,\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,1 0,2 0,1
b,\(m_{Fe}=0,1.56=5,6\left(g\right)\)
\(\Rightarrow\%m_{Fe}=\dfrac{5,6.100\%}{12}=46,67\%;\%m_{Cu}=100-46,67=53,33\%\)
c,\(m_{HCl}=0,2.36,5=7,3\left(g\right)\Rightarrow m_{ddHCl}=\dfrac{7,3.100}{14,6}=50\left(g\right)\)
a. PTHH : Mg + 2HCl ➝ MgCl2 + H2 (1)
b. theo bài : nH2 = 3,36 : 22,4 = 0,15 (mol)
theo (1) nMg = nH2 = 0,15 (mol)
➞ mMg = 0,15 ✖ 24 = 3,6 (g)
➞ %mMg = (3,6 : 5)✖100 = 72%
➞ %mCu = 100% - 72% = 28%
c. theo (1) nHCl = 2nH2 = 2✖0,15 = 0,3 (mol)
mHCl = 0,3✖36,5 = 10,95(g)
➜mddHCl = (10,95✖100):14,6 = 75(g)
d. dung dịch Y : MgCl2
mdd(spư)= 3,6+75-0,3 = 78,3(g)
theo (1) nMgCl2 = nH2 = 0,15(mol)
mMgCl2 = 0,15✖95 = 14,25(g)
C%MgCl2 = (14,25 : 78,3)✖100 = 18,199%
a.\(m_{dd.Br_2\left(tăng\right)}=m_{C_2H_2}=2,6g\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(n_{C_2H_2}=\dfrac{2,6}{26}=0,1mol\)
\(\%V_{C_2H_2}=\dfrac{0,1}{0,25}.100=40\%\)
\(\%V_{CH_4}=100\%-40\%=60\%\)
b.\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,1 0,2 ( mol )
\(C_{M\left(dd.Br_2\right)}=\dfrac{0,2}{0,1}=2M\)
a, \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,2 0,2
(do Cu ko tác dụng với HCl loãng)
b, \(m_{Zn}=0,2.65=13\left(g\right)\)
\(m_{Cu}=19,4-13=6,4\left(g\right)\)
a,\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,2 0,4 0,2
\(\Rightarrow\%m_{Zn}=\dfrac{0,2.65.100\%}{21,1}=61,61\%;\%m_{ZnO}=100-61,61=38,39\%\)
b,\(n_{ZnO}=\dfrac{21,1-13}{81}=0,1\left(mol\right)\)
PTHH: ZnO + 2HCl → ZnCl2 + H2O
Mol: 0,1 0,2
\(m_{ddHCl}=\dfrac{\left(0,2+0,4\right).36,5.100\%}{7,3\%}=300\left(g\right)\)
c,
PTHH: Zn + H2SO4 → ZnSO4 + H2
Mol: 0,2 0,2
PTHH: ZnO + H2SO4 → ZnSO4 + H2O
Mol: 0,1 0,1
\(n_{H_2SO_4}=0,2+0,1=0,3\left(mol\right)\Rightarrow V_{ddH_2SO_4}=\dfrac{0,3}{0,5}=0,6\left(l\right)=600\left(ml\right)\)
\(m_{ddH_2SO_4}=600.1,12=672\left(g\right)\)
\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{H_2}=n_{Zn}=0,3\left(mol\right)\\ \Rightarrow m_{Zn}=0,3.65=19,5\left(g\right)>m_{hh}\left(?\right)\)
Bạn xem lại đề nha!
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,2\left(mol\right)\)
⇒ mZn = 0,2.65 = 13 (g)
⇒ mCu = 19,4 - 13 = 6,4 (g)
Bạn tham khảo nhé!
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{H_2}=0,5\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,5}{0,1}=5\left(M\right)\)
c, Ta có: 65nZn + 24nMg = 10,1 (1)
Theo PT: \(n_{H_2}=n_{Zn}+n_{Mg}=0,25\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{Zn}=0,1\left(mol\right)\\n_{Mg}=0,15\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Zn}=0,1.65=6,5\left(g\right)\\m_{Mg}=0,15.24=3,6\left(g\right)\end{matrix}\right.\)
\(A.Zn+2HCl\rightarrow ZnCl_2+H_2\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ B.n_{H_2}=\dfrac{5,6}{22,4}=0,25mol\\ n_{Zn}=a,n_{Mg}=b\\ \Rightarrow\left\{{}\begin{matrix}65a+24b=10,1\\a+b=0,25\end{matrix}\right.\\ \Rightarrow a=0,1;b=0,15\\ n_{HCl}=0,1.2+0,15.2=0,5mol\\ C_{M_{HCl}}=\dfrac{0,5}{0,1}=5M\\ C.m_{Zn}=0,1.65=6,5g\\ m_{Mg}=10,1-6,5=3,6g\)