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a)
$Zn + H_2SO_4 \to ZnSO_4 + H_2$
n ZnSO4 = n Zn = 19,5/65 = 0,3(mol)
m ZnSO4 = 0,3.161 = 48,3(gam)
b)
n H2 = n Zn = 0,3(mol)
V H2 = 0,3.22,4 = 6,72(lít)
c) $CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
n CuO / 1 = 16/80 = 0,2 < n H2 / 1 = 0,3 nên H2 dư
n H2 pư = n CuO = 0,2(mol)
m H2 dư = (0,3 - 0,2).2 = 0,2(gam)
PTHH: Zn + H2SO4 (loãng) -> ZnSO4 + H2
Ta có:\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
Theo PTHH và đề bài, ta có:
\(n_{ZnSO_4}=n_{H_2}=n_{Zn}=0,3\left(mol\right)\)
a) Khối lượng ZnSO4 thu đc:
\(m_{ZnSO_4}=0,3.161=48,3\left(g\right)\)
b) Thể tích khí H2 thu được (đktc):
\(V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\)
c) PTHH: H2 + CuO -to-> Cu + H2O
Ta có:
\(n_{H_2}=0,3\left(mol\right)\)
\(n_{CuO}=0,2\left(mol\right)\)
Theo PTHH và đề bài, ta có:
\(\dfrac{0,3}{1}< \dfrac{0,2}{1}\)
=> H2 dư, CuO hết nên tính theo nCuO
Theo PTHH và đb , ta có:
\(n_{H_2}\)(phản ứng) \(=n_{CuO}=0,2mol\)
\(\Rightarrow n_{H_2\left(dư\right)}=0,3-0,2=0,1\left(mol\right)\)
nZn = 19.5/65 = 0.3 (mol)
Zn + H2SO4 => ZnSO4 + H2
0.3........................0.3.........0.3
VH2 = 0.3*22.4 = 6.72 (l)
mZnSO4 = 0.3*161 = 48.3 (g)
nCuO = 16/80 = 0.2 (mol)
CuO + H2 -to-> Cu + H2O
0.2........0.2
=> H2 dư
mH2 (dư) = ( 0.3 - 0.2 ) * 2 = 0.2 (g)
nZn=0,3(mol)
a) PTHH: Zn + H2SO4 -> ZnSO4+ H2
0,3___________________0,3____0,3(mol)
mZnSO4=161.0,3=48,3(g)
b) V(H2,đktc)=0,3.22,4=6,72(l)
c) nCuO=16/80=0,2(mol)
PTHH: CuO + H2 -to-> Cu + H2O
vì: 0,3/1 > 0,2/1
=> H2 dư, CuO hết, tính theo nCuO
=> n(H2,dư)=0,3-0,2=0,1(mol)
=> mH2(dư)=0,1.2=0,2(g)
a, \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo PT: \(n_{ZnCl_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
b, \(n_{H_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(n_{HCl}=0.2\cdot1=0.2\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(........0.2..............0.1\)
\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(n_{CuO}=\dfrac{16}{80}=0.2\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)
\(0.1.......0.1....0.1\)
\(\Rightarrow CuOdư\)
\(m_{Cu}=0.1\cdot64=6.4\left(g\right)\)
200ml = 0,2l
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,3 0,6 0,3 0,3
a) \(n_{ZnCl2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
\(C_{M_{ZnCl2}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)
b) \(n_{H2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,3.22,4=6,72\left(l\right)\)
c) Pt : \(NaOH+HCl\rightarrow NaCl+H_2O|\)
1 1 1 1
0,6 0,6
\(n_{NaOH}=\dfrac{0,6.1}{1}=0,6\left(mol\right)\)
\(m_{NaOH}=0,6.40=24\left(g\right)\)
\(m_{ddNaOH}=\dfrac{24.100}{20}=120\left(g\right)\)
Chúc bạn học tốt
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2--->0,3-------->0,1----------->0,3
b) `V_{H_2} = 0,3.22,4 = 6,72 (l)`
c) `m_{H_2SO_4} = 0,3.98 = 29,4 9g)`
d) \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
PTHH: \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
Xét tỉ lệ: 0,2 < 0,3 => H2 dư
a) \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,25----------------->0,25
=> VH2 = 0,25.22,4 = 5,6 (l)
b)
\(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,25}{1}\) => CuO hết, H2 dư
PTHH: CuO + H2 --to--> Cu + H2O
0,2-------------->0,2
=> mCu = 0,2.64 = 12,8 (g)
a) \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
0,3------------------>0,15----->0,45
=> \(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)
b)
PTHH: 2H2 + O2 --to-->2H2O
0,45->0,225
=> \(V_{O_2}=0,225.22,4=5,04\left(l\right)\)
=> Vkk = 5,04 : 20% = 25,2 (l)
\(n_{Zn}=\dfrac{19.5}{65}=0.3\left(mol\right)\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(0.3........................0.3..........0.3\)
\(m_{ZnSO_4}=0.3\cdot161=48.3\left(g\right)\)
\(V_{H_2}=0.3\cdot22.4=6.72\left(l\right)\)
\(n_{CuO}=\dfrac{16}{80}=0.2\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(0.2..........0.3\)
\(LTL:\dfrac{0.2}{1}< \dfrac{0.3}{1}\Rightarrow H_2dư\)
\(m_{H_2\left(dư\right)}=\left(0.3-0.2\right)\cdot2=0.2\left(g\right)\)
a) $Zn + H_2SO_4 → ZnSO_4 + H_2$
b) n ZnSO4 = n Zn = 19,5/65 = 0,3(mol)
=> m ZnSO4 = 0,3.161 = 48,3(gam)
c) n H2 = n Zn = 0,3(mol)
V H2 = 0,3.22,4 = 6,72 lít
c)
$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
n CuO = 16/80 = 0,2(mol) < n H2 = 0,3 nên H2 dư
n H2 pư = n CuO = 0,2(mol)
=> m H2 dư = (0,3 - 0,2).2 = 0,2(gam)