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Zn + 2HCl --> ZnCl2 + H2
\(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
=> \(m_{ZnCl_2}=0,4.136=54,4\left(g\right)\)
\(V_{H_2}=0,4.22,4=8,96\left(l\right)\)
\(nZn=\dfrac{26}{65}=0,4mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,4-->0,8----->0,4------->0,4
\(mZnCl_2=136.0,4=54,4g\)
\(VH_2=0,4.22,4=8,96lít\)
a) Zn +2 HCl ➜ ZnCl2 + H2
b) nZn = 0,2 (mol)
Zn + 2HCl ➜ ZnCl2 + H2
0,2 ➜ 0,2 ➜ 0,2 (mol)
mZn = 0,2 x 101,5 = 20,3 (g)
d) VH2 = 0,2 x 22,4 = 4,48 (lít)
Vote nhé ^w^
b) Zn + 2HCl ➜ ZnCl2 + H2
0,2 ➜ 0,4 ➜ 0,2 ➜0,2 (mol)
mHCl = 0,4 x 36,5= 14,6 (g)
Vote vs follow me nhé !! ^w^
\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=\dfrac{m}{M}=\dfrac{16,25}{65}=0,25\left(mol\right)\\ Theo.PTHH:n_{HCl}=2.n_{Zn}=2.0,25=0,5\left(mol\right)\\ m_{HCl}=n.M=0,5.36,5=18,25\left(g\right)\)
\(Theo.PTHH:n_{H_2}=n_{Zn}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,25.22,4=5,6\left(l\right)\)
a)PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b)Khối lượng Zn:\(m_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Ta có: \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\)
Khối lượng axit HCl cần dùng là: \(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
c)Theo pt ta có: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
Thể tích H2 là: \(V_{H_2}=n.22,4=0,25.22,4=5,6\left(ml\right)\)
a)
Zn + 2HCl → ZnCl2 + H2
b) nZn = \(\dfrac{3,5}{65}\)=\(\dfrac{7}{130}\) mol
Theo tỉ lệ phản ứng => nH2 = nZn= \(\dfrac{7}{130}\)mol
<=> V H2 = \(\dfrac{7}{130}\).22,4 = 1,206 lít
c) nZnCl2 = nZn => mZnCl2 = \(\dfrac{7}{130}\).136= 7,32 gam
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ n_{HCl}=\dfrac{18,25}{35}=0,5\left(mol\right)\\ a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{0,5}{2}>\dfrac{0,2}{1}\Rightarrow HCldư\\ n_{HCl\left(dư\right)}=0,5-0,2.2=0,1\left(mol\right)\\ m_{HCl}=0,1.36,5=3,65\left(g\right)\\ c.n_{ZnCl_2}=n_{Zn}=n_{H_2}=0,2\left(mol\right)\\ m_{ZnCl_2}=0,2.136=27,2\left(g\right)\\ V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
\(n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\)
a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,2 0,5 0,2 0,2
b) Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{0,5}{2}\)
⇒ Zn phản ứng hết , HCl dư
⇒ Tính toán dựa vào số mol của Zn
\(n_{HCl\left(dư\right)}=0,5-\left(0,2.2\right)=0,1\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
c) \(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)
\(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
Chúc bạn học tốt
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2____0,4_____________0,2
\(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(V_{H2}=0,2.22,4=4,48\left(l\right)\)
\(4H_2+Fe_3O_4\rightarrow3Fe+4H_2O\)
0,2_____________0,15____
\(m_{Fe}=0,15.56=8,4\left(g\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=1\left(mol\right)\\n_{H_2}=0,5\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{1\cdot36,5}{20\%}=182,5\left(g\right)\\V_{H_2}=0,5\cdot22,4=11,2\left(l\right)\end{matrix}\right.\)
1, \(a,Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=0,3\left(mol\right)\Rightarrow n_{ZnCl2}=n_{H2}=0,3\left(mol\right)\)
\(n_{HCl}=0,6\left(mol\right)\)
\(\Rightarrow V_{H2}=0,3.22,4=6,72\left(l\right)\)
\(c,m_{ZnCl2}=40,8\left(g\right)\)
2.\(a,Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=0,05\left(mol\right)\)
\(\Rightarrow n_{H2}=n_{ZnCl2}=0,05\left(mol\right)\)
\(\Rightarrow V_{H2}=0,05.22,4=1,12\left(l\right)\)
\(m_{ZnCl2}=6,8\left(g\right)\)
\(c,n_{CuO}=0,1\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{to}}Cu+H_2O\)
Dư CuO . Tạo 0,05 mol Cu
\(\Rightarrow m_{Cu}=3,2\left(g\right)\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{39}{65}=0,6\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Zn}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)
c, \(n_{H_2}=n_{Zn}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.24,79=14,874\left(l\right)\)
d, - Quỳ tím hóa đỏ do HCl dư.
a)\(Zn++2HCl-->ZnCl2+H2\)
b)\(n_{Zn}=\frac{13}{65}=0,2\left(mol\right)\)
\(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\)
\(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c)\(n_{ZnCl2}=n_{Zn}=0,2\left(mol\right)\)
\(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)
d)\(n_{H2}=n_{Zn}=0,2\left(mol\right)\)
\(V_{H2}=0,2.22,4=4,48\left(l\right)\)
a) PTHH: Zn + 2HCl → ZnCl2 + H2↑
nZn = 13 : 65 = 0,2 mol
Theo PTHH: nHCl = 2.nZn = 0,4 mol
mHCl = 0,4 . 36,5 = 14,6(g)
mZnCl2=0,2.136=27,2 g
nH2 = nZn = nZnCl2= 0,2 mol
VH2 = 0,2 . 22,4 = 4,48 (l)