Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_K=\dfrac{m}{M}=\dfrac{7,8}{39}=0,2\left(mol\right)\)
\(a,PTHH:4K+O_2\rightarrow2K_2O\)
\(0,2:0,05:0,1\left(mol\right)\)
\(K_2O+H_2O\rightarrow2KOH\)
\(0,1:0,1:0,2\left(mol\right)\)
\(b,V_{O_2}=n.22,4=0,05.22,4=1,12\left(l\right)\)
\(c,m_{KOH}=n.M=0,2.\left(39+16+1\right)=0,2.56=11,2\left(g\right)\)
nK=mM=7,839=0,2(mol)��=��=7,839=0,2(���)
a,PTHH:4K+O2→2K2O�,����:4�+�2→2�2�
0,2:0,05:0,1(mol)0,2:0,05:0,1(���)
K2O+H2O→2KOH�2�+�2�→2���
0,1:0,1:0,2(mol)0,1:0,1:0,2(���)
b,VO2=n.22,4=0,05.22,4=1,12(l)�,��2=�.22,4=0,05.22,4=1,12(�)
c,mKOH=n.M=0,2.(39+16+1)=0,2.56=11,2(g)�,����=�.�=0,2.(39+16+1)=0,2.56=11,2(�)
a, \(n_{Ca}=\dfrac{12}{40}=0,3\left(mol\right)\)
PT: \(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\)
Theo PT: \(n_{H_2}=n_{Ca}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
b, \(n_{Ca\left(OH\right)_2}=n_{Ca}=0,3\left(mol\right)\Rightarrow m_{Ca\left(OH\right)_2}=0,2.74=22,2\left(g\right)\)
c, \(n_{Fe_3O_4}=\dfrac{8,4}{232}=\dfrac{21}{580}\left(mol\right)\)
PT: \(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)
Xét tỉ lệ: \(\dfrac{\dfrac{21}{580}}{1}< \dfrac{0,3}{4}\), ta được H2 dư.
Theo PT: \(n_{Fe}=3n_{Fe_3O_4}=\dfrac{63}{580}\left(mol\right)\Rightarrow m_{cr}=m_{Fe}=\dfrac{63}{580}.56=\dfrac{882}{145}\left(g\right)\)
\(n_K=\dfrac{7,8}{39}=0,2\left(mol\right)\\
pthh:2K+2H_2O\rightarrow2KOH+H_2\uparrow\)
QT chuyển xanh
\(pthh:2K+2H_2O\rightarrow2KOH+H_2\)
0,2 0,2 0,1
\(V_{H_2}=0,1.22,4=2,24\left(L\right)\\
m_{KOH}=0,2.56=11,2\left(g\right)\)
\(pthh:Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)
0,1 0,075
=> \(m_{Fe}=\left(0,075.56\right).80\%=3,36g\)
\(n_K=\dfrac{3,9}{39}=0,1mol\)
\(2K+2H_2O\rightarrow2KOH+H_2\)
0,1 0,1 0,05 ( mol )
\(m_{KOH}=0,1.56=5,6g\)
\(V_{H_2}=0,05.22,4=1,12l\)
Ba + 2H2O -- > Ba(OH)2 + H2
nBa = 27,4 / 137 = 0,2 (mol)
mBa(OH)2 = 0,2 . 171 = 34,2 (g)
VH2 = 0,2.22,4 = 4,48 (l)
VH2(thực tế ) = 4,48 .80%=3,584 (l )
2K+2H2O->2KOH+H2
0,3------------------------0,15
H2+Ag2O-to>2Ag+H2O
0,15----0,15---------0,3
n K=0.3 mol
VH2=0,15.22,4=3,36l
n Ag2O=0,2 mol
=>Ag2Odư
=>m cr=0,3.108+0,05.232=44g
\(a,n_K=\dfrac{11,7}{39}=0,3\left(mol\right)\)
PTHH: \(K+H_2O\rightarrow KOH+\dfrac{1}{2}H_2\)
0,3---------------------->0,15
\(b,\rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\)
\(c,n_{Ag_2O}=\dfrac{46,4}{232}=0,2\left(mol\right)\\ \rightarrow n_O=0,2\left(mol\right)\)
PTHH: \(O+H_2\rightarrow H_2O\)
bđ 0,2 0,15
pư 0,15 0,15
spư 0,05 0
\(\rightarrow m_{CR}=46,4-0,15.16=44\left(g\right)\)
2K +2H2O → 2KOH +H2
nK = 5.46:39=0,14 mol →nH2 = 0.07 mol → nKOH =0,14 mol
VH2=0.07*22.4=1,568 lít
mKOH = 0,14 (39+16+1)=7,84 g
a)
KK + H2H2OO → KOHKOH + H2H2
b)
nKnK = 5,46395,4639 = 0,140,14 molmol
nH2nH2 = 0,14×110,14×11 = 0,140,14 molmol
VH2VH2 = 0,140,14 × 22,422,4 = 3,1363,136 ll
c)
nKOHnKOH = 0,14×110,14×11 = 0,140,14 molmol
mKOHmKOH = 0,140,14 × 5656 = 7,847,84 gamgam