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nH2SO4 = 9,8 : 98 = 0,1 (mol)
pthh : 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
0,06<-0,1---------------------------> 0,1 (mol)
=> mAl = 0,06 . 27 = 1,8 (g)
=>VH2 = 0,1 . 22,4 = 2,24 (l)
pthh : H2 + CuO -t--> Cu +H2O
0,1------------->0,1 (MOL)
=> mCu = 0,1 . 64 = 6,4 (g)
hình như bn ghi sai r đó phải là:đồng oxit mới phải chứ
CuO+H2-to>Cu+H2O
0,09----0,09---0,09
n CuO=\(\dfrac{7,2}{80}\)=0,09 mol
=>m Cu=0,09.64=5,76g
=>VH2=0,09.22,4=2,016l
\(n_{CuO}=\dfrac{7,2}{80}=0,09mol\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,09 0,09 0,09 ( mol )
\(m_{Cu}=0,09.64=5,76g\)
\(V_{H_2}=0,09.22,4=2,016l\)
a, \(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{1}{15}\left(mol\right)\Rightarrow m_{Fe_3O_4}=\dfrac{1}{15}.232=\dfrac{232}{15}\left(g\right)\)
c, \(n_{H_2}=\dfrac{4}{3}n_{Fe}=\dfrac{4}{15}\left(mol\right)\Rightarrow V_{H_2}=\dfrac{4}{15}.22,4=\dfrac{448}{75}\left(l\right)\)
d, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(n_{Zn}=n_{H_2}=\dfrac{4}{15}\left(mol\right)\Rightarrow m_{Zn}=\dfrac{4}{15}.65=\dfrac{52}{3}\left(g\right)\)
\(n_{HCl}=2n_{H_2}=\dfrac{8}{15}\left(mol\right)\Rightarrow m_{HCl}=\dfrac{8}{15}.36,5=\dfrac{292}{15}\left(g\right)\)
A. \(H_2+CuO\rightarrow Cu+H_2O\)
B. \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
Theo PTHH: \(n_{Cu}=n_{CuO}=0,1\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)
C. Theo PTHH: \(n_{H_2}=n_{CuO}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
a, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{4}n_{Al}=0,225\left(mol\right)\Rightarrow V_{O_2}=0,225.22,4=5,04\left(l\right)\)
c, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,15\left(mol\right)\Rightarrow m_{KClO_3}=0,15.122,5=18,375\left(g\right)\)
a) nCu=0,2(mol)
PTHH: CuO + H2 -to-> Cu + H2O
b) nH2=nCuO=nCu=0,2(mol)
=>V(H2,đktc)=0,2.22,4=4,48(l)
c) mCuO=0,2.80=16(g)
a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c, \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta có: \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ a,PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{HCl}=2.0,2=0,4\left(mol\right);n_{H_2}=n_{Mg}=0,2\left(mol\right)\\ b,m_{HCl}=0,4.36,5=14,6\left(g\right)\\ c,n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Vì:\dfrac{0,2}{1}< \dfrac{0,3}{1}\Rightarrow CuOdư\\ n_{Cu}=n_{H_2}=0,2\left(mol\right)\\ m_{Cu}=0,2.64=12,8\left(g\right)\)
đồng 3 oxit á ý c ik
ko hiểu j hết luôn á