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Bài 4:
4Na + O2 → 2Na2O
nNa = \(\dfrac{4,6}{23}\)= 0,2 mol , nO2 = \(\dfrac{2,24}{22,4}\)= 0,1 mol
\(\dfrac{nNa}{4}\)<\(\dfrac{nO_2}{1}\)=> Sau phản ứng oxi dư , nO2 phản ứng = \(\dfrac{nNa}{4}\)= 0,05 mol
=> nO2 dư = 0,1 - 0,05 = 0,05 mol <=> mO2 dư = 0,05.32= 1,6 gam
a) nNa2O = 1/2 nNa = 0,1 mol
=> mNa2O = 0,1. 62 = 6,2 gam
Bài 1:
Zn + 2HCl → ZnCl2 + H2
a) nZn = \(\dfrac{6,5}{65}\)= 0,1 mol , nHCl = \(\dfrac{3,65}{36,5}\)= 0,1 mol
Ta có \(\dfrac{nZn}{1}\)> \(\dfrac{nHCl}{2}\)=> Zn dư , HCl phản ứng hết
nZnCl2 = \(\dfrac{nHCl}{2}\)= 0,5 mol => mZnCl2 = 0,5. 136 = 68 gam
b) nH2 = \(\dfrac{nHCl}{2}\) = 0,5 mol => V H2 = 0,5.22,4 = 11,2 lít
a) \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1-------------->0,1------>0,1
\(\Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
b) \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c) \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
0,1<---0,1
\(\Rightarrow m_{CuO}=0,1.80=8\left(g\right)\)
a: Zn+2HCl->ZnCl2+H2
0,2 0,4 0,2 0,2
mZnCl2=0,2*136=27,2(g)
b: V=0,2*22,4=4,48(lít)
nKClO3 = 49 : 122,5 =0,4(mol)
a) pthh : 2KClO3 -t--> 2KCl + 3O2
0,4------------>0,4----->0,6(mol)
mKCl = 0,4.74,5=29,8 (g)
VO2= 0,6.22,4= 13,44 (l)
câu 2
a nZn = 6,5:65=0,1(mol)
pthh : Zn +2HCl ---> ZnCl2 + H2
0,1->0,2----------------->0,1(mol)
=> VH2 = 0,1.22,4 =2,24(l)
=> mHCl = 0,2 . 36,5=7,3 (g)
\(a,n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1--->0,2------>0,1----->0,1
\(\rightarrow m_{ddHCl}=\dfrac{0,2.36,5}{10\%}=73\left(g\right)\\ b,m_{ZnCl_2}=0,1.136=13,6\left(g\right)\\ V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(nZn=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(Zn+2HCl->ZnCl_2+H_2\)
0,1 0,2 0,1 0,1 (mol)
\(mHCl=0,2.36,5=7,3\left(g\right)\)
=> \(mddHCl=\dfrac{7,3.100}{10}=73\left(g\right)\)
mZnCl2 = 0,1 . 136 = 13,6 )g_
VH2 = 0,1 . 22,4 = 2,24 (l)
a) \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1-->0,2------>0,1-->0,1
=> VH2 = 0,1.22,4 = 2,24 (l)
mZnCl2 = 0,1.136 = 13,6 (g)
b) \(C\%_{dd.HCl}=\dfrac{0,2.36,5}{200}.100\%=3,65\%\)
c) \(n_{O_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: 2H2 + O2 --to--> 2H2O
Xét tỉ lệ: \(\dfrac{0,1}{2}< \dfrac{0,15}{1}\) => H2 hết, O2 dư
PTHH: 2H2 + O2 --to--> 2H2O
0,1--------------->0,1
=> mH2O = 0,1.18 = 1,8 (g)
Bài 1 :
224ml = 0,224l
\(n_{H2}=\dfrac{0,224}{22,4}=0,01\left(mol\right)\)
Pt : \(Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2|\)
1 2 1 1
0,01 0,01 0,01
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2|\)
1 1 1
0,01 0,01
\(n_{Ba}=\dfrac{0,01.1}{1}=0,01\left(mol\right)\)
\(m_{Ba}=0,01.137=1,37\left(g\right)\)
\(m_{BaO}=2,9-1,37=1,53\left(g\right)\)
0/0Ba = \(\dfrac{1,37.100}{2,9}=47,24\)0/0
0/0BaO = \(\dfrac{1,53.100}{2,9}=52,76\)0/0
Có : \(m_{BaO}=1,53\left(g\right)\)
\(n_{BaO}=\dfrac{1,53}{153}=0,01\left(mol\right)\)
\(n_{Ba\left(OH\right)2\left(tổng\right)}=0,01+0,01=0,02\left(mol\right)\)
⇒ \(m_{Ba\left(OH\right)2}=0,02.171=3,42\left(g\right)\)
Chúc bạn học tốt
Bài 2:
a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=200.7,3\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,1 0,2 0,1 0,1
Ta có: \(\dfrac{0,1}{1}< \dfrac{0,4}{2}\) ⇒ Zn pứ hết, HCl dư
\(m_{HCldư}=\left(0,4-0,2\right).36,5=7,3\left(g\right)\)
b, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(m_{dd.sau.pứ}=6,5+200-0,1.2=206,3\left(g\right)\)
\(C\%_{HCldư}=\dfrac{7,3.100\%}{206,3}=3,54\%\)
\(C\%_{ZnCl_2}=\dfrac{0,1.136.100\%}{206,3}=6,59\%\)
a, Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
___0,1_________________0,1 (mol)
Ta có: \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Theo PT: \(n_{Fe}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{Fe}=\dfrac{1}{15}.56\approx3,73\left(g\right)\)
Bạn tham khảo nhé!
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,1mol\) \(0,2mol\) \(0,1mol\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)
\(V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)
\(n_{Zn}=\dfrac{6.5}{65}=0.1\left(mol\right)\)
\(n_{Fe}=\dfrac{6.5}{56}=\dfrac{13}{112}\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(V_{H_2}=\left(0.1+\dfrac{13}{112}\right)\cdot22.4=4.84\left(l\right)\)