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a,\(n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right);n_K=\dfrac{3,9}{39}=0,1\left(mol\right)\)
PTHH: 2Na + 2H2O → 2NaOH + H2
Mol: 0,2 0,1
PTHH: 2K + 2H2O → 2KOH + H2
Mol: 0,1 0,05
b, \(n_{H_2}=0,1+0,05=0,15\left(mol\right)\)
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\)
c,mdd sau pứ=4,6+3,9+91,5-0,15.2=99,7 (g)
\(\%m_{NaOH}=\dfrac{0,2.40.100\%}{99,7}=8,02\%\)
\(\%m_{KOH}=\dfrac{0,1.56.100\%}{99,7}=5,62\%\)
Bài 3 :
\(n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\)
\(n_K=\dfrac{3,9}{39}=0,1\left(mol\right)\)
a) Pt : \(2Na+2H_2O\rightarrow2NaOH+H_2|\)
2 2 2 1
0,2 0,2 0,1
\(2K+2H_2O\rightarrow2KOH+H_2|\)
2 2 2 1
0,1 0,1 0,05
b) \(n_{H2\left(tổng\right)}=0,1+0,05=0,15\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,15.22,4=3,36\left(l\right)\)
c) \(n_{NaOH}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
⇒ \(m_{NaOH}=0,2.40=8\left(g\right)\)
\(n_{KOH}=\dfrac{0,05.2}{1}=0,1\left(mol\right)\)
⇒ \(m_{KOH}=0,1.56=5,6\left(g\right)\)
\(m_{ddspu}=8,5+91,5-\left(0,15.2\right)=99,7\left(g\right)\)
\(C_{NaOH}=\dfrac{8.100}{99,7}=8,02\)0/0
\(C_{KOH}=\dfrac{5,6.100}{99,7}=5,62\)0/0
Chúc bạn học tốt
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: 2K + 2H2O --> 2KOH + H2
0,3<-------------0,3<---0,15
=> mK = 0,3.39 = 11,7 (g)
=> mKOH(A) = 21,1 - 11,7 = 9,4 (g)
mKOH(dd sau pư) = 0,3.56 + 9,4 = 26,2 (g)
a = 200 + 0,15.2 - 21,1 = 179,2 (g)
\(C\%=\dfrac{26,2}{200}.100\%=13,1\%\) => x = 13,1
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=100.14,6\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,4}{2}\), ta được HCl dư.
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, Theo PT: \(\left\{{}\begin{matrix}n_{HCl\left(pư\right)}=2n_{Zn}=0,2\left(mol\right)\\n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{HCl\left(dư\right)}=0,4-0,2=0,2\left(mol\right)\)
Ta có: m dd sau pư = 6,5 + 100 - 0,1.2 = 106,3 (g)
\(\Rightarrow\left\{{}\begin{matrix}C\%_{ZnCl_2}=\dfrac{0,1.136}{106,3}.100\%\approx12,79\%\\C\%_{HCl\left(dư\right)}=\dfrac{0,2.36,5}{106,3}.100\%\approx6,87\%\end{matrix}\right.\)
a) $n_{Al} = \dfrac{0,81}{27} = 0,03(mol) ; n_{HCl} = \dfrac{1,825}{36,5} = 0,05(mol)$
$2Al + 6HCl \to 2AlCl_3 + 3H_2$
Vì :
$n_{Al} : 2 > n_{HCl} : 6$ nên Al dư
$n_{H_2} = \dfrac{1}{2}n_{HCl} = 0,025(mol)$
$V_{H_2} = 0,025.24,79 = 0,61975(lít)$
b) $n_{Al\ pư} = \dfrac{1}{3} n_{HCl} = \dfrac{0,05}{3}(mol)$
Ta thấy : $m_{Al} - m_{H_2} = \dfrac{0,05}{3}.27 - 0,025.2 = 0,4 > 0$
Do đó, dung dịch tăng so với khối lượng dung dịch HCl ban đầu 0,4 gam
\(n_{Na}=\dfrac{6,9}{23}=0,3\left(mol\right)\\ 2Na+2H_2O\rightarrow2NaOH+H_2\\ n_{H_2}=\dfrac{0,3}{2}=0,15\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\\ b,m_{ddsaup.ứ}=m_{Na}+m_{H_2O}-m_{H_2}=6,9+100-0,15.2=106,6\left(g\right)\)
\(a) Fe + 2HCl \to FeCl_2\\ b) n_{HCl} = \dfrac{182,5.5\%}{36,5} = 0,25(mol)\\ n_{FeCl_2} = n_{H_2} = n_{Fe} = \dfrac{1}{2}n_{HCl} = 0,125(mol)\\ \Rightarrow m_{Fe} = 0,125.56 = 7(gam) ; V = 0,125.22,4 = 2,8(lít)\\ c) m_{dd\ sau\ phản\ ứng} = m_{Fe} + m_{dd\ HCl} - m_{H_2} = 7 + 182,5 - 0,125.2 = 189,25(gam)\\ C\%_{FeCl_2} = \dfrac{0,125.127}{189,25}.100\% = 8,39\%\)
Fe+2HCl->FeCl2+H2
0,125--0,25---0,125-0,125
m HCl=9,125 g=>n HCl=\(\dfrac{9,125}{26,5}\)=0,25 mol
=>m Fe=0,125.56=7g
=>VH2=0,125.22,4=2,8l
=>C%FeCl2=\(\dfrac{0,125.127}{7+182,5-0,25}\).100=8,388%
a)\(n_K=\dfrac{0,39}{39}=0,01mol\)
\(\left\{{}\begin{matrix}X:KOH\\Y:H_2\end{matrix}\right.\)
b)\(2K+2H_2O\rightarrow2KOH+H_2\)
0,01 0,01 0,01 0,005
\(V_{H_2}=0,005\cdot22,4=0,112l=112ml\)
bn có thể giải phần c ko :)