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a) 4P + 5O2 --to--> 2P2O5
b) \(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)
PTHH: 4P + 5O2 --to--> 2P2O5
_____0,1-->0,125---->0,05
=> mP2O5 = 0,05.142 = 7,1 (g)
c) VO2 = 0,125.22,4 = 2,8(l)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,3------------->0,3--->0,3
=> mZnCl2 = 0,3.136 = 40,8 (g)
c) VH2 = 0,3.22,4 = 6,72 (l)
a. \(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
b. \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
Mol theo PTHH : \(1:2:1:1\)
Mol theo phản ứng : \(0,3\rightarrow0,6\rightarrow0,3\rightarrow0,3\)
\(\Rightarrow m_{ZnCl_2}=n_{ZnCl_2}.M_{ZnCl_2}=0,3.\left(65+71\right)=40,8\left(g\right)\)
c. Từ b. \(\Rightarrow n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72\left(l\right)\)
và khí hiđro.
\(n_{Zn}=\dfrac{32,25}{65}=0,49mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,49 0,49 ( mol )
\(V_{H_2}=0,49.22,4=10,976l\)
a) Ta có PTHH sau: Zn + 2HCl ---> ZnCl2 + H2
b) Ta có: nZn = 32,25/65 ∼0,5(mol)
=> nH2 = 0,5(mol)
=> V của H2 là: 0,5x22,4 = 11,2(l)
Chúc bn học tốt :)
Zn+2HCl->ZnCl2+H2
0,2-----0,4---0,2----0,2
nZn=0,2 mol
=>m Hcl=0,4.36,5=14,6g
m muối=0,2.136=27,2g
=>VH2=0,2.22,4=4,48l
`Zn + 2HCl -> ZnCl_2 + H_2` `\uparrow`
`n_(Zn) = 13/65 = 0,2 mol`.
`n_(HCl) = 0,4 mol`.
`m_(HCl) = 0,4 xx 36,5 = 14,6g`.
c, `m_(ZnCl_2) = 0,2 xx 127 = 25,4 g`.
`d, V_(H_2) = 0,2 xx 22,4 = 4,48l`.
\(n_{H_2O}=\dfrac{3,6}{18}=0,2\left(mol\right)\\ P_2O_5+3H_2O\rightarrow2H_3PO_4\\ a,n_{P_2O_5}=n_{H_2O}:3=0,2:3=\dfrac{1}{15}\left(mol\right)\\ \Rightarrow m_{P_2O_5}=\dfrac{142.1}{15}=\dfrac{142}{15}\left(g\right)\\ b,n_{H_3PO_4}=\dfrac{2}{3}.0,2=\dfrac{2}{15}\left(mol\right)\\ \Rightarrow m_{H_3PO_4}=98.\dfrac{2}{15}=\dfrac{196}{15}\left(g\right)\)
\(m_{HCl}=50.7,3\%=3,65\left(g\right)\\ n_{HCl}=\dfrac{3,65}{36,5}=0,1\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=n_{ZnCl_2}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\\ m_{Zn}=0,05.65=3,25\left(g\right)\\ V_{H_2\left(ĐKTC\right)}=0,05.22,4=1,12\left(l\right)\\ m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
mHCl=50.7,3%=3,65(g) -> nHCl=0,1(mol)
a) PTHH: Zn + 2 HCl -> ZnCl2 + H2
nH2=nZnCl2=nZn=nHCl/2= 0,1/2=0,05(mol)
b) m=mZn=0,05.65=3,25(g)
c) V(H2,đktc)=0,05.22,4=1,12(l)
d) mZnCl2= 136.0,05= 7,8(g)
1. \(4P+5O_2\underrightarrow{^{t^o}}2P_2O_5\)
2. Ta có: \(n_P=\dfrac{1,24}{31}=0,04\left(mol\right)\)
Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,02\left(mol\right)\Rightarrow m_{P_2O_5}=0,02.142=2,84\left(g\right)\)
3. \(n_{O_2}=\dfrac{5}{4}n_P=0,05\left(mol\right)\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)
Câu 1:
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\Rightarrow m_{Zn}=0,5.36,5=18,25\left(g\right)\)
Câu 2:
a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
b, \(n_P=\dfrac{1,24}{31}=0,04\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{5}{4}n_P=0,05\left(mol\right)\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)
c, \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,02\left(mol\right)\Rightarrow m_{P_2O_5}=0,02.142=2,84\left(g\right)\)
1.
`Zn+2HCl->ZnCl_2+H_2`
0,25---0,5---------------0,25
`n_Zn=(16,25)/65=0,25 mol`
`=>V_(H_2)=0,25.22,4=5,6l`
`=>m_(HCl)=0,5.36,5=18,25g`
2.
`4P+5O_2->2P_2O_5`(to)
0,04---0,05----0,02
`nP=(1,24)\31=0,04 mol`
`V_(O_2)=0,05.22,4=1,12l`
`m_(P_2O_5)=0,02.142=2,84g`