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\(n_{H2}=\dfrac{6,72}{24,79}\approx0,27\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
a) Theo Pt : \(n_{HCl}=2n_{H2}=2.0,27=0,54\left(mol\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{0,54.36,5}{4,38\%}.100\%=450\left(g\right)\)
b) Theo Pt : \(n_{H2}=n_{ZnO}=0,27\left(mol\right)\Rightarrow m_{Zn}=0,27.65=17,55\left(g\right)\)
Chúc bạn học tỏt
Ta có: \(n_{H_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)
Theo ĐLBT KL: mZn + mH2SO4 = mZnSO4 + mH2
⇒ mH2SO4 = 9 + 0,1.2 - 6,5 = 2,7 (g)
nH2 = \(\dfrac{11,1555}{24,79}=0,45\left(mol\right)\)
PTHH: 2M + 2xHCl -> 2MClx + xH2
0,9 <-------------- 0,45
mHCl = 0,9 . 36,5 = 32,85 (g)
mH2 = 0,45 . 2 = 0,9 (g)
Áp dụng ĐLBTKL, ta có:
mM + mHCl = mMClx + mH2
=> mM = 40,04 + 0,9 - 32,85 = 8,09 (g)
%mM = \(\dfrac{8,09}{10}=80,9\%\)
\(1.\\ a)M_x=\dfrac{1}{0,01}=100g/mol\\ b)n=\dfrac{1,2395}{24,79}=0,05mol\\ M=\dfrac{3,2}{0,05}=64\\ 2.\\ n_{Al}=\dfrac{2,7}{27}=0,1mol\\ n_{HCl}=\dfrac{14,6}{36,5}=0,4mol\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ \Rightarrow\dfrac{0,1}{2}< \dfrac{0,4}{6}\Rightarrow HCl.dư\\ n_{H_2}=\dfrac{0,1.3}{2}=0,15mol\\ V_{H_2}=0,15.24,79=3,7185l\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
\(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
1 2 1 1
0,05 0,1 0,05 0,05
a) \(V_{H_2}=n.24,79=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=n.M=0,05.\left(65+35,5.2\right)=6,8\left(g\right)\)
b) \(PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta cos tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\Rightarrow\) CuO dư.
Theo ptr, ta có: \(n_{Cu}=n_{H_2}=0,05mol\\ \Rightarrow m_{Cu}=n.M=0,05.64=3,2\left(g\right).\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
THeo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
b, Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,05\left(mol\right)\Rightarrow m_{Cu}=0,05.64=3,2\left(g\right)\)
Sửa đề: Cho \(65g\) kẽm
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{H_2}=\dfrac{24,79}{24,79}=1(mol)\\ \Rightarrow m_{H_2}=1.2=2(g)\\ \text {Bảo toàn KL}:m_{HCl}=m_{ZnCl_2}+m_{H_2}-m_{Zn}=136+2-65=73(g)\)
\(Zn+2HCl->ZnCl_2+H_2\\ m_{Zn}=\dfrac{7,437}{24,79}\cdot65=19,5g\\ m_{HCl}=\dfrac{7,437}{24,79}\cdot2\cdot36,5=21,9g\)
Zn+2HCl->ZnCl2+H2
0,89 0,89
nH2=19,832/22,4\(\simeq0.89\left(mol\right)\)
=>nZn=0,89(mol)
m=0,89*65=57,85(g)