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nKClO3 = 49 : 122,5 =0,4(mol)
a) pthh : 2KClO3 -t--> 2KCl + 3O2
0,4------------>0,4----->0,6(mol)
mKCl = 0,4.74,5=29,8 (g)
VO2= 0,6.22,4= 13,44 (l)
câu 2
a nZn = 6,5:65=0,1(mol)
pthh : Zn +2HCl ---> ZnCl2 + H2
0,1->0,2----------------->0,1(mol)
=> VH2 = 0,1.22,4 =2,24(l)
=> mHCl = 0,2 . 36,5=7,3 (g)
a)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2-->0,4----->0,2--->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
b) mHCl = 0,4.36,5 = 14,6 (g)
=> \(m_{dd.HCl}=\dfrac{14,6.100}{7,3}=200\left(g\right)\)
c)
mdd sau pư = 13 + 200 - 0,2.2 = 212,6 (g)
mZnCl2 = 0,2.136 = 27,2 (g)
=> \(C\%=\dfrac{27,2}{212,6}.100\%=12,8\%\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
d, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3\%}=200\left(g\right)\)
⇒ m dd sau pư = 13 + 200 - 0,2.2 = 212,6 (g)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,79\%\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{4,8}{65}=\dfrac{24}{325}\left(mol\right)\)
Đến đây thì ra số mol hơi xấu, bạn xem lại đề nhé.
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=1\left(mol\right)\\n_{H_2}=0,5\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{1\cdot36,5}{20\%}=182,5\left(g\right)\\V_{H_2}=0,5\cdot22,4=11,2\left(l\right)\end{matrix}\right.\)
a) n Fe = 28/56 = 0,5(mol)
$Fe + 2HCl \to FeCl_2 + H_2$
Theo PTHH :
n HCl = 2n Fe = 1(mol)
=> m dd HCl = 1.36,5/10% = 365(gam)
b)
n FeCl2 = n H2 = n Fe = 0,5(mol)
Suy ra :
V H2 = 0,5.22,4 = 11,2(lít)
m FeCl2 = 0,5.127 = 63,5(gam)
c)
Sau phản ứng:
mdd = m Fe + mdd HCl - m H2 = 28 + 365 - 0,5.2 = 392(gam)
=> C% FeCl2 = 63,5/392 .100% = 16,2%
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,1 0,1 ( mol )
\(V_{H_2}=0,1.22,4=2,24l\)
\(m_{ZnCl_2}=0,1.136=13,6g\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 0.1
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{ZnCl_2}=0,1\cdot135=13,5g\)
a) Số mol kẽm tham gia phản ứng : \(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{16,25}{65}=0,25\left(mol\right)\).
PTHH : \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Mol : 1 : 2 : 1 : 1
Mol : 0,25 → 0,5 → 0,25 → 0,5
Suy ra, số mol dung dịch Axit Clohidric \(HCl\) tham gia phản ứng là \(n_{HCl}=0,5\left(mol\right)\).
Khối lượng dung dịch đã dùng : \(m_{HCl}=n_{HCl}.M_{HCl}=\left(0,5\right).\left(36,5\right)=18,25\left(g\right)\).
b) Từ câu a, suy ra số mol khí Hidro sinh ra là \(n_{H_2}=0,25\left(mol\right)\).
Thể tích khí Hydro sinh ra là : \(V_{H_2}=n_{H_2}.22,4=\left(0,25\right).\left(22,4\right)=5,6\left(l\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
+\(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
+\(nH_2=n_{Zn}=0,5\left(mol\right)\)
+\(n_{HCl}=2n_{Zn}=1\left(mol\right)\)
+\(V_{H2}=0,5.22,4=11,2\left(lit\right)\)
\(m_{HCl}=1.36,5=36,5\left(gam\right)\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
\(Zn\) \(+\) \(2\)\(HCl\) → \(ZnCl_2\) \(+\) \(H_2\)
\(0,5\) \(mol\) → \(1\) \(mol\) → \(0,5\)\(mol\) → \(0,5\) \(mol\)
\(V_{H_2}=n.22,4=0,5.22,4=11,2\left(l\right)\)
\(m_{HCl}=n.M=1.36,5=36,4\left(g\right)\)
\(m_{HCl}=219.10\%=21,9\left(g\right)\Rightarrow n_{HCl}=\dfrac{21,9}{36,5}=0,6\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo PT: \(n_{ZnCl_2}=n_{H_2}=\dfrac{1}{2}n_{HCl}=0,3\left(mol\right)\)
a, \(V_{H_2}=0,3.24,79=7,437\left(l\right)\)
b, \(m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)