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\(n_{Zn}=\dfrac{32,25}{65}=0,49mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,49 0,49 ( mol )
\(V_{H_2}=0,49.22,4=10,976l\)
a) Ta có PTHH sau: Zn + 2HCl ---> ZnCl2 + H2
b) Ta có: nZn = 32,25/65 ∼0,5(mol)
=> nH2 = 0,5(mol)
=> V của H2 là: 0,5x22,4 = 11,2(l)
Chúc bn học tốt :)
a) \(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\)
b) \(n_{Mg}=\dfrac{4,8}{24}=0,2mol\)
\(n_{HCl}=2.n_{Mg}=0,2.2=0,4mol\)
\(\Rightarrow m_{HCl}=n.M=0,4.36,5=14,6g\)
c) \(n_{H_2}=n_{Mg}=0,2mol\)
Thể tích khí hidro sinh ra (ở đktc):
\(V_{H_2}=0,2.24,79=4,958l.\)
a. \(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)
PTHH : Zn + 2HCl -> ZnCl2 + H2
0,1 0,2 0,1
b. \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c. \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{HCl}=0,2\cdot36,5=7,3g\)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{ZnCl_2}=\dfrac{13,6}{136}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1<-----------0,1----->0,1
=> mZn = 0,1.65 = 6,5 (g)
b) VH2 = 0,1.22,4 = 2,24 (l)
$a)$
$Mg+H_2SO_4\to MgSO_4+H_2$
$b)$
$n_{Mg}=\frac{2,4}{24}=0,1(mol)$
Theo PT: $n_{MgSO_4}=n_{Mg}=0,1(mol)$
$\to m_{MgSO_4}=0,1.120=12(g)$
$c)$
$CuO+H_2\xrightarrow{t^o}Cu+H_2O$
Theo PT: $n_{Cu}=n_{H_2}=n_{Mg}=0,1(mol)$
$\to m_{Cu}=0,1.64=6,4(g)$
2Al+6HCl->2AlCl3+3H2
0,4--------------------------0,6
n Al=0,4 mol
=>VH2=0,6.22,4=13,44l
H2+HgO-tO>Hg+H2O
0,6--------------0,6
=>m Hg=0,6.201=120,6g
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,4 0,6
\(\rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\\ PTHH:HgO+H_2\underrightarrow{t^o}Hg+H_2P\)
0,6 0,6
\(\rightarrow m_{Hg}=0,6.201=120,6\left(g\right)\)
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PTHH :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,3 0,6 0,3 0,3
\(a,V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
\(m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
\(b,V_{ddHCl}=\dfrac{n}{C_M}=\dfrac{0,6}{2}=0,3\left(l\right)\)
\(c,Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,1 0,3
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Ta có :
\(\dfrac{0,1}{1}=\dfrac{0,3}{3}\)
nên không chất nào dư
\(n_{Mg}=\dfrac{6}{24}=0,25\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 0,25.........0,5.........0,25.......0,25\left(mol\right)\\ a.V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ b.m_{HCl}=0,5.36,5=18,25\left(g\right)\\ c.n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\ Fe_2O_3+3H_2\underrightarrow{^{to}}2Fe+3H_2O\\ Vì:\dfrac{0,25}{3}< \dfrac{0,1}{1}\\ \Rightarrow Fe_2O_3dư\\ n_{Fe}=\dfrac{2}{3}.0,25=\dfrac{1}{6}\left(mol\right)\\ \Rightarrow m_{Fe}=\dfrac{1}{6}.56\approx9,333\left(g\right)\)
a,\(n_{Mg}=\dfrac{6}{24}=0,25\left(mol\right)\)
PTHH: Mg + 2HCl → MgCl2 + H2
Mol: 0,25 0,5 0,25
\(\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)
b,\(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
c,\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 → 2Fe + 3H2O
Mol: 0,25 \(\dfrac{1}{6}\)
Ta có: \(\dfrac{0,1}{1}>\dfrac{0,25}{3}\)⇒ Fe2O3 dư, H2 hết
\(m_{Fe}=\dfrac{1}{6}.56=9,33\left(g\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{HCl}=2n_{Zn}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{H_2}=n_{Zn}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\)
b) mHCl = 14,6 (g)
V H2 = 4,48 (l)
Giải thích các bước:
a) PTHH: Zn + 2HCl → ZnCl2 + H2↑
b) nZn = 13 : 65 = 0,2 mol
Theo PTHH: nHCl = 2.nZn = 0,4 mol
mHCl = 0,4 . 36,5 = 14,6(g)
c) nH2 = nZn = 0,2 mol
VH2 = 0,2 . 22,4 = 4,48 (l)
và khí hiđro.
\(n_{Mg}=\dfrac{2,4}{24}=0,1mol\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,1 0,1 ( mol )
\(V_{H_2}=0,1.22,4=2,24l\)
nMg = 2,4 : 24 = 0,1 (mol)
pthh : Mg + 2HCl -t--> MgCl2 + H2
0,1--->0,2 (mol)
=> VH2 = 0,2 . 22,4 = 4,48 (L)