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a, Theo gt ta có: $n_{H_2}=0,15(mol);n_{O_2}=0,05(mol)$
$2H_2+O_2\rightarrow 2H_2O$
Sau phản ứng $H_2$ còn dư. Và dư 0,05.22,4=1,12(l)
b, Ta có: $n_{H_2O}=2.n_{O_2}=0,1(mol)\Rightarrow m_{H_2O}=1,8(g)$
a. \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
\(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH : 2Mg + O2 -> 2MgO
0,2 0,1 0,2
Xét tỉ lệ : \(\dfrac{0,2}{2}< \dfrac{0,3}{1}\) => Mg đủ , O2 dư
\(m_{O_2\left(dư\right)}=\left(0,3-0,1\right).32=6,4\left(g\right)\)
b) \(m_{MgO}=0,2.40=8\left(g\right)\)
Thiếu đề, anh cho là 100ml ddHCl 1M nhé
a,\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right);n_{HCl}=0,1.1=0,1\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,1 0,05 0,05
b,Ta có: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\) ⇒ Zn dư, HCl pứ hết
c,\(m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
\(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
a) Fe2O3 + 6HCl --> 2FeCl3 + 3H2O
\(n_{Fe_2O_3}=\dfrac{3,2}{160}=0,02\left(mol\right)\)
\(n_{HCl}=\dfrac{2,19}{36,5}=0,06\left(mol\right)\)
Xét tỉ lệ \(\dfrac{0,02}{1}>\dfrac{0,06}{6}\) => Fe2O3 dư, HCl hết
PTHH: Fe2O3 + 6HCl --> 2FeCl3 + 3H2O
0,01<--0,06------->0,02---->0,03
=> \(m_{Fe_2O_3\left(dư\right)}=\left(0,02-0,01\right).160=1,6\left(g\right)\)
b) \(m_{FeCl_3}=0,02.162,5=3,25\left(g\right)\)
\(m_{H_2O}=0,03.18=0,54\left(g\right)\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\a, PTHH:4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\\ Vì:\dfrac{0,2}{4}< \dfrac{0,2}{3}\Rightarrow O_2dư\\ \Rightarrow n_{O_2\left(dư\right)}=0,2-\dfrac{3}{4}.0,2=0,05\left(mol\right)\\ \Rightarrow m_{O_2\left(dư\right)}=0,05.32=1,6\left(g\right)\\ b,n_{Al_2O_3}=\dfrac{n_{Al}}{2}=\dfrac{0,2}{2}=0,1\left(mol\right)\\ \Rightarrow m_{Al_2O_3}=102.0,1=10,2\left(g\right)\)
a, Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PT: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
Xét tỉ lệ: \(\dfrac{0,2}{4}< \dfrac{0,2}{3}\), ta được O2 dư.
Theo PT: \(n_{O_2\left(pư\right)}=\dfrac{3}{4}n_{Al}=0,15\left(mol\right)\)
\(\Rightarrow n_{O_2\left(dư\right)}=0,05\left(mol\right)\)
\(\Rightarrow m_{O_2\left(dư\right)}=0,05.32=1,6\left(g\right)\)
b, Theo PT: \(n_{Al_2O_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)
Bạn tham khảo nhé!
a)
$4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3$
b) $n_{Al} = \dfrac{8,1}{27} = 0,3(mol)$
$n_{O_2} = \dfrac{13,44}{22,4} = 0,6(mol)$
Ta thấy :
$n_{Al} : 4 < n_{O_2} : 3$ nên $O_2$ dư
$n_{O_2\ pư} = \dfrac{3}{4}n_{Al} = 0,4(mol)$
$m_{O_2\ dư} = (0,6 - 0,4).32 = 6,4(gam)$
c) $n_{Al_2O_3} = \dfrac{1}{2}n_{Al} = 0,15(mol)$
$m_{Al_2O_3} = 0,15.102 = 15,3(gam)$
a)
$4Fe + 3O_2 \xrightarrow{t^o} 2Fe_2O_3$
b)
$n_{Fe} = \dfrac{11,2}{56} = 0,2(mol) ; n_{O_2} = \dfrac{8,96}{22,4} = 0,4(mol)$
Ta thấy :
$n_{Fe} : 4 > n_{O_2} : 3$ nên $O_2$ dư
$n_{O_2\ pư} = = \dfrac{3}{4}n_{Fe} = 0,15(mol)$
$\Rightarrow m_{O_2\ dư} = (0,4 - 0,15).32 = 8(gam)$
c) $n_{Fe_2O_3} = \dfrac{1}{2}n_{Fe} = 0,1(mol)$
$m_{Fe_2O_3} = 0,1.160 = 16(gam)$
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bn tham khảo nhé
\(PTHH:4Al+3O_2->2Al_2O_3\)
BĐ 0,4 0,27 (mol)
PU 0,36---->0,27---->0,18 (mol)
CL 0,04---->0------>0,18 (mol)
b)
\(n_{Al}=\dfrac{m}{M}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{6,048}{22,4}=0,27\left(mol\right)\)
\(\dfrac{n_{Al}}{4}>\dfrac{n_{O_2}}{3}\left(\dfrac{0,4}{4}>\dfrac{0,27}{3}\right)\)
=> Al dư, O2 hết (tính theo O2)
\(m_{Al}=n\cdot M=0,04\cdot27=1,08\left(g\right)\)
c)
\(m_{Al_2O_3}=n\cdot M=0,18\cdot\left(27\cdot2+16\cdot3\right)=18,36\left(g\right)\)
a, PT: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, Ta có: \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
\(n_{O_2}=\dfrac{6,048}{22,4}=0,27\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,4}{4}>\dfrac{0,27}{3}\), ta được Al dư.
Theo PT: \(n_{Al\left(pư\right)}=\dfrac{4}{3}n_{O_2}=0,36\left(mol\right)\)
\(\Rightarrow n_{Al\left(dư\right)}=0,4-0,36=0,04\left(mol\right)\)
\(\Rightarrow m_{Al\left(dư\right)}=0,04.27=1,08\left(g\right)\)
c, Theo PT: \(n_{Al_2O_3}=\dfrac{2}{3}n_{Al}=0,18\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}=0,18.102=18,36\left(g\right)\)
\(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\\ n_{O_2}=\dfrac{22,4}{22,4}=1\left(mol\right)\\ 4P+5O_2\underrightarrow{^{to}}2P_2O_5\\ Vì:\dfrac{0,1}{4}< \dfrac{1}{5}\Rightarrow O_2dư\\ n_{O_2\left(dư\right)}=1-\dfrac{5}{4}.0,1=0,875\left(mol\right)\\ m_{O_2}=0,875.32=28\left(g\right)\\ n_{P_2O_5}=\dfrac{2}{4}.0,1=0,05\left(mol\right)\\ m_{P_2O_5}=0,05.142=7,1\left(g\right)\)
\(n_P=\dfrac{3,1}{31}=0,1\left(mol\right);n_{O_2}=\dfrac{22,4}{22,4}=1\left(mol\right)\)
PTHH: 4P + 5O2 ---to→ 2P2O5
Mol: 0,1 0,125 0,05
Ta có: \(\dfrac{0,1}{4}< \dfrac{1}{5}\) ⇒ P hết, O2 dư
\(m_{O_2dư}=\left(1-0,125\right).32=28\left(g\right)\)
\(m_{P_2O_5}=0,05.142=7,1\left(g\right)\)