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a) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b) \(n_{ZnCl_2}=\dfrac{20,4}{136}=0,15\left(mol\right)\)
\(n_{H_2}=n_{ZnCl_2}=0,15\left(mol\right)\)
\(V_{H_2\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\)
c) \(m_{H_2}=0,15.2=0,3\left(g\right)\)
\(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)
\(m_{HCl}=0,3.36,5=10,95\left(g\right)\)
\(m_{Zn}=20,4+0,3-10,95=9,75\left(g\right)\)
Zn + 2HCl ---> ZnCl2 + H2
0.2-→0.4------→0.2--→0.2 (mol)
nZn = 11,2\56 = 0.2(mol)
mZnCl2 = n*M = 0.2*127 = 25.4(g)
VH2(đktc) = n*22.4 = 0.2*22.4 = 4.48(l)
mHCl = n*M = 0.4*36.5 = 14.6(g)
C% =14,6\146*100% = 10(%)
\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.n_{Zn}=\dfrac{11,2}{65}=0,17\left(mol\right)\\ TheoPT:n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,17\left(mol\right)\\ m_{ZnCl_2}=0,17.136=23,12\left(g\right)\\ V_{H_2}=0,17.22,4=3,808\left(l\right)\\ c.n_{HCl}=2n_{Zn}=0,34\left(mol\right)\\ C\%_{HCl}=\dfrac{0,34.36,5}{146}.100=8,5\%\)
nZn = 13 / 65 = 0,2 (mol)
Zn + 2HCl --- > ZnCl2 + H2
0,2 0,4 0,2 0,2
mZnCl2 = 0,2 . 136 = 27,2 (g)
VH2 = 0,2 . 22,4 = 4,48(l)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{13}{65}=0,2mol\)
\(PTHH:Zn+2HCl\rightarrow ZnCl+H_2\uparrow\)
\(1\) : \(2\) : \(1\) : \(1\) \(\left(mol\right)\)
\(0,2\) \(0,4\) \(0,2\) \(0,2\) \(\left(mol\right)\)
\(b,m_{ZnCl_2}=n.M=0,2.136=27,2\left(g\right)\)
\(c,V_{H_2}=n.22,4=0,2.22,4=4,48\left(l\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1.22,4=2,24l\\
m_{HCl}=\left(0,2.36,5\right).10\%=0,73g\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\
pthh:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\
LTL:\dfrac{0,1}{1}>\dfrac{0,1}{3}\)
=> Fe2O3 dư
\(n_{Fe}=\dfrac{2}{3}n_{H_2}=0,067\left(mol\right)\\
m_{Fe}=0,067.56=3,73g\)
a.b.\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 ( mol )
\(V_{H_2}=0,1.22,4=2,24l\)
\(m_{ddHCl}=\dfrac{0,2.36,5}{10\%}=73g\)
c.\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 > 0,1 ( mol )
0,1 1/15 ( mol )
\(m_{Fe}=\dfrac{1}{15}.56=3,73g\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,2 0,4 0,2 0,2
a) \(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
⇒ \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(C_{HCl}=\dfrac{14,6.100}{100}=14,6\)0/0
b) \(n_{H2}=\dfrac{0,4.1}{2}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
\(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)
c) \(n_{HCl}=\dfrac{36,5}{36,5}=1\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,2 1 0,2
Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{1}{2}\)
⇒ Zn phản ứng hết , Hcl dư
⇒ Tính toán dựa vào số mol của Zn
\(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)
\(n_{HCl\left(dư\right)}=1-\left(0,2.2\right)=0,6\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,6.36,5=14,6\left(g\right)\)
Chúc bạn học tốt
a, Ta có: nZn=\(\dfrac{13}{65}\)=0,2 mol
Zn + 2HCl ---> ZnCl2 + H2
Ta có: nZn=\(\dfrac{1}{2}\)nHCl => nHCl=0,1 mol
=> mHCl=0,1.36,5=3,65 g
=> a%=\(\dfrac{3,65.100}{100}\)=3,65%
b, Ta có: nZn=nZnCl2 = nH2= 0,2 mol
=> VH2=0,2.22,4=4,48 l
=> mZnCl2=0,2.136=27,2 g
c, Zn + 2HCl ---> ZnCl2 + H2
Ta có: nHCl=\(\dfrac{36.5}{36.5}\)=1 mol
Ta có: \(\dfrac{n_{HCl}}{n_{Zn}}=\dfrac{1}{0,2}\) => HCl dư tính theo Zn
Ta có: nZn=nZnCl2 = nH2= 0,2 mol
=> VH2=0,2.22,4=4,48 l
=> mZnCl2=0,2.136=27,2 g
Theo gt ta có: $n_{Zn}=0,1(mol)$
a, $Zn+2HCl\rightarrow ZnCl_2+H_2$
b, Ta có: $n_{H_2}=0,1(mol)\Rightarrow V_{H_2}=2.24(l)$
c, Ta có: $n_{HCl}=2.n_{Zn}=0,2(mol)\Rightarrow m_{HCl}=7,3(g)$
\(a.n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,2\left(mol\right)\\ m_{ZnCl_2}=0,2.136=27,2\left(g\right)\\ V_{H_2}=0,2.22,4=4,48\left(l\right)\\ b.n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ CuO+H_2-^{t^o}\rightarrow Cu+H_2O\\ LTL:\dfrac{0,15}{1}< \dfrac{0,2}{1}\\ \Rightarrow H_2dưsauphảnứng\\ n_{Cu}=n_{H_2\left(pứ\right)}=n_{H_2O}=n_{CuO}=0,15\left(mol\right)\\ m_{Cu}=0,15.64=9,6\left(g\right)\\ m_{H_2\left(dư\right)}=\left(0,2-0,15\right).2=0,1\left(g\right)\\ m_{H_2O}=0,15.18=2,7\left(g\right)\)
nZn = 13/65 = 0,2 (mol)
PTHH: Zn + 2HCl -> ZnCl2 + H2
Mol: 0,2 ---> 0,4 ---> 0,2 ---> 0,2
mZnCl2 = 0,2 . 136 = 27,2 (g)
VH2 = 0,2 . 22,4 = 4,48 (l)
nCuO = 12/80 = 0,15 (mol)
PTHH: CuO + H2 -> (t°) Cu + H2O
LTL: 0,15 < 0,2 => H2 dư
nCuO (p/ư) = nCu = nH2O = nCuO = 0,15 (mol)
mCu = 0,15 . 64 = 9,6 (g)
mH2O = 0,15 . 18 = 2,7 (g)
mCuO (dư) = (0,2 - 0,15) . 80 = 4 (g)
a)
\(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
PTHH: Zn + H2SO4 --> ZnSO4 + H2
0,25-->0,25------------->0,25
=> VH2 = 0,25.22,4 = 5,6 (l)
b) \(C_{M\left(dd.H_2SO_4\right)}=\dfrac{0,25}{0,3}=\dfrac{5}{6}M\)
c) \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,25}{3}\) => Fe2O3 dư, H2 hết
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
\(\dfrac{0,25}{3}\) <--0,25----->\(\dfrac{0,5}{3}\)
=> \(m=32-\dfrac{0,25}{3}.160+\dfrac{0,5}{3}.56=28\left(g\right)\)
PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
đb: 0,25
a) số mol của Zn là: \(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Theo PTHH, ta có: \(n_{H_2}=\dfrac{0,25\cdot1}{1}=0,25\left(mol\right)\)
Thể tích của H2 ở đktc là: \(V_{H_2\left(đktc\right)}=n_{H_2}\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\)
2 câu còn lại mk chịu
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
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