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\(m_{CuO}=50.20\%=10\left(g\right)\)
\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)
\(m_{Fe_2O_3}=50-10=40\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)
PTHH :
\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,125 0,125 0,125
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,25 0,75 0,5
\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)
\(b,m_{Cu}=0,125.64=8\left(g\right)\)
\(m_{Fe}=0,5.56=28\left(g\right)\)
\(\left\{{}\begin{matrix}m_{CuO}=50.20\%=10\left(g\right)\\m_{Fe_2O_3}=50-10=40\left(g\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\\n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\end{matrix}\right.\)
PTHH:
\(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
0,125->0,125
\(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2\)
0,25--->0,75
\(\Rightarrow V_{H_2}=\left(0,75+0,125\right).22,4=18,2\left(l\right)\)
ta có :
%mCuO=20% => mCuO= 10 g => nCuO=0,125(mol)
=> mFe2O3=40 (g)=>nFe2O3=0,25 ( mol)
Ta có PTHH :
\(\left(1\right)CuO+H2\rightarrow Cu+H2O\)
0,125mol..0,125mol
\(\left(2\right)Fe2O3+3H2\rightarrow2Fe+3H2O\)
0,25mol.........0,75mol
=> VH2(đktc)=(0,125+0,75).22,4=19,6(l)
Vậy thể tích khí H2 cần dùng là 19,6 (l)
1
\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)
\(\Rightarrow m_{Cu}=6-2,8=3,2g\)\(\Rightarrow n_{Cu}=0,05mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,05 0,05
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,075 0,05
\(\Rightarrow\Sigma n_{H_2}=0,075+0,05=0,125mol\)
\(\Rightarrow V=0,125\cdot22,4=2,8l\)
CHÚC BẠN HỌC TỐT
a) Theo đề bài, ta có: \(n_{O2}=\dfrac{20}{32}=0,625\left(mol\right)\)
PTHH: \(2H_2+O_2\underrightarrow{o}2H_2O\)
pư............1.........0,5......1 (mol)
Ta có tỉ lệ: \(\dfrac{1}{2}< 0,625\). Vậy O2 dư, H2 hết.
\(\Rightarrow m_{H2O}=18.1=18\left(g\right)\)
Vậy.........
Gọi số mol CuO và Fe2O3 là a, b (mol)
=> 80a + 160b = 56 (1)
PTHH: CuO + H2 --to--> Cu + H2O
Fe2O3 + 3H2 --to--> 2Fe + 3H2O
CuO + CO --to--> Cu + CO2
Fe2O3 + 3CO --to--> 2Fe + 3CO2
=> 64a + 112b = 43,2 (2)
(1)(2) => a = 0,5 (mol); b = 0,1 (mol)
\(n_{H_2\left(lý.thuyết\right)}=n_{CO\left(lý.thuyết\right)}=a+3b=\)0,8 (mol)
=> \(n_{H_2\left(tt\right)}=n_{CO\left(tt\right)}=\dfrac{0,8.120}{100}=0,96\left(mol\right)\)
=> \(V_{H_2\left(tt\right)}=V_{CO\left(tt\right)}=0,96.22,4=21,504\left(l\right)\)
PT: Fe2O3+3H2to→2Fe+3H2O
CuO+H2to→Cu+H2O
a, Ta có: mFe2O3=20.60%=12(g)
⇒nFe2O3=\(\dfrac{12}{160}\)=0,075(mol
mCuO=20−12=8(g
⇒nCuO=\(\dfrac{8}{80}\)=0,1(mol)
Theo pT:
nFe=2nFe2O3=0,15(mol)
nCu=nCuO=0,1(mol)
⇒mFe=0,15.56=8,4(g)
mCu=0,1.64=6,4(g)
b, Theo PT: nH2=3nFe2O3+nCuO=0,325(mol)
⇒VH2=0,325.22,4=7,28(l)
c. Zn+2HCl->ZnCl2+H2
0,65----------0,325
=>m HCl=0,65.36,5=23,725g
_ \(m_{Fe_2O_3}=0,8.50=40\left(g\right)\) \(\Rightarrow m_{CuO}=50-40=10\left(g\right)\)
_ \(n_{Fe_2O_3}=\dfrac{40}{160}=0,25mol\); \(n_{CuO}=\dfrac{10}{80}=0,125mol\)
PTHH: \(3H_2+Fe_2O_3\rightarrow2Fe+3H_2O\)
_____0,75mol_0,25mol
\(H_2+CuO\rightarrow Cu+H_2O\)
0,125__0,125 (mol)
\(\Rightarrow V_{H_2}=\left(0,75+0,125\right)22,4=19,6l\)
\(m_{CuO}=40.20\%=8\left(g\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(n_{Fe_2O_3}=\dfrac{40-8}{160}=0,2\left(mol\right)\)
PTHH:
\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,1 0,1
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,2 0,6
\(V_{H_2}=\left(0,1+0,6\right).22,4=15,68\left(l\right)\)