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\(a) Zn + H_2SO_4 \to ZnSO_4 + H_2\\ b) n_{H_2SO_4}= n_{H_2}= n_{Zn} = \dfrac{19,5}{65} =0,3(mol)\\ m_{H_2SO_4} = 0,3.98 = 29,4(gam)\\ c) V_{H_2} = 0,3.22,4 = 6,72(lít)\\ d) Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O\\ n_{Fe} = \dfrac{2}{3}n_{H_2} = 0,2(mol)\\ m_{Fe} = 0,2.56 = 11,2(gam)\)
nZn = 19,5 : 65= 0,3 (mol)
pthh Zn + 2HCl ---> ZnCl2 + H2
0,3--------------> 0,3-------> 0,3 (mol)
=> mZnSO4 = 0,3 . 161 ( g)
=> VH2 = 0,3 . 22,4 = 6,72 (l)
nCuO = 16 : 80 =0,2 (mol)
pthh : CuO + H2 -t--> Cu + H2O
LTL :
0,2/1 < 0,3/1
=> H2 du
ta co : nH2 (pu ) = nCuO = 0,2 (MOL)
=> nH2(d) = nH2 ( bd ) - nH2 (pu) = 0,3-0,2 = 0,1 (mol)
nZn = 19,5/65 = 0,3 (mol)
PTHH: Zn + H2SO4 -> ZnSO4 + H2
Mol: 0,3 ---> 0,3 ---> 0,3 ---> 0,3
mZnSO4 = 0,3 . 161 = 48,3 (g)
VH2 = 0,3 . 22,4 = 6,72 (l)
nCuO = 16/80 = 0,2 (mol)
PTHH: CuO + H2 -> (t°) Cu + H2O
LTL: 0,2 < 0,3 => H2 dư
nH2 (pư) = 0,2 (mol)
mH2 (dư) = (0,3 - 0,2) . 2 = 0,2 (g)
Bài 1:
\(a,PTHH:Zn+H_2SO_4\to ZnSO_4+H_2\\ b,m_{Zn}+m_{H_2SO_4}=m_{ZnSO_4}+m_{H_2}\\ c,m_{H_2SO_4}=32,2+0,4-13=19,6(g) \)
Bài 2:
Bảo toàn KL: \(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\)
\(\Rightarrow m_{H_2}=6,5+7,3-13,6=0,2(g)\)
Bài 3:
Bảo toàn KL: \(m_{Mg}+m_{O_2}=m_{MgO}\)
\(\Rightarrow m_{O_2}=1000-600=400(g)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
a. \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
Theo PTHH: \(n_{ZnSO_4}=n_{Zn}=0,1\left(mol\right)\)
\(\Rightarrow m_{muối}=0,1.161=16,1\left(g\right)\)
b. \(n_{H_2thu.được}=n_{Zn}=0,1\left(mol\right)\)
\(H_2+\dfrac{1}{2}O_2\underrightarrow{t^o}H_2O\)
0,1 0,05
\(V_{O_2}=0,05.22,4=1,12\left(l\right)\)
\(\Rightarrow V_{không.khí}=1,12.5=5,6\left(l\right)\)
\(a) Zn + H_2SO_4 \to ZnSO_4 + H_2\\ b) n_{H_2} = n_{Zn} = \dfrac{13}{65}=0,2(mol)\\ V_{H_2} = 0,2.22,4 = 4,48(lít)\\ c) CuO + H_2 \xrightarrow{t^o} Cu + H_2O\\ n_{CuO} = n_{H_2} = 0,2(mol)\\ m_{CuO} = 0,2.80 = 16(gam)\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{16,25}{65}=0,25\left(mol\right)\\ PTHH:Zn+H_2SO_4->ZnSO_4+H_2\)
tỉ lệ 1 : 1 : 1 : 1
n(mol) 0,25-->0,25------->0,25------>0,25
\(V_{H_2\left(dktc\right)}=n\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\\ m_{ZnSO_4}=n\cdot M=0,25\cdot\left(65+32+16\cdot4\right)=40,25\left(g\right)\)
`n_Zn = m/M = 6,5/65 = 0,1 (mol) `
\(PTHH:Zn+H_2SO_4->ZnSO_4+H_2\)
Tỉ lệ: 1 : 1 : 1 : 1
n(mol) 0,1---->0,1-------------->0,1--->0,1
\(m_{H_2SO_4}=n\cdot M=0,1\cdot\left(2+32+16\cdot4\right)=9,8\left(g\right)\)
\(V_{H_2\left(dkt\right)}=n\cdot24=0,1\cdot24=2,4\left(l\right)\)
\(m_{ZnSO_4}=n\cdot M=0,1\cdot\left(65+32+16\cdot4\right)=16,1\left(g\right)\)
\(PTPU:Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(0,1:0,1:0,1:0,1\left(mol\right)\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(a,m_{H_2SO_4}=n.M=0,1.\left(2+32+16.4\right)=9,8\left(g\right)\)
\(b,V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)
\(c,m_{ZnSO_4}=n.M=0,1.\left(65+32+16.4\right)=16,1\left(g\right)\)