Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(n_{H_2SO_4}=0,2.1,35=0,27\left(mol\right)\)
PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Xét tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,27}{3}\), ta được Al dư.
Theo PT: \(n_{H_2}=n_{H_2SO_4}=0,27\left(mol\right)\Rightarrow V_{H_2}=0,27.22,4=6,048\left(l\right)\)
b, \(n_{Al\left(pư\right)}=\dfrac{2}{3}n_{H_2SO_4}=0,18\left(mol\right)\)
\(\Rightarrow m_{Al\left(pư\right)}=0,18.27=4,86\left(g\right)\)
c, \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2SO_4}=0,09\left(mol\right)\)
\(\Rightarrow C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0,09}{0,2}=0,45\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{CuSO_4}=0.2\cdot0.5=0.1\left(mol\right)\)
\(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)
\(0.1.............0.2.................0.1..........0.1\)
\(C_{M_{Na_2SO_4}}=\dfrac{0.1}{0.3+0.2}=0.2\left(M\right)\)
\(Cu\left(OH\right)_2\underrightarrow{^{^{t^0}}}CuO+H_2O\)
\(0.1.............0.1\)
\(m_{CuO}=0.1\cdot80=8\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=0,1\left(mol\right)\\n_{NaOH}=0,015\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,015}{0,1}=0,15\)
=> Tạo muối NaHCO3
\(CO_2\left(0,015\right)+NaOH\left(0,015\right)\rightarrow NaHCO_3\left(0,015\right)\)
\(\Rightarrow C_{M_{NaHCO_3}}=\dfrac{0,015}{0,015}=1\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(C\%_{NaOH}=\dfrac{8}{8+100}.100\%\approx7,41\%\)
\(n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)
V dd sau hòa tan = 100 (ml) = 0,1 (l)
\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,2}{0,1}=2\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Fe + 2HCl $\to$ FeCl2 + H2
n Fe = 5,6/56 = 0,1(mol) ; n HCl = 0,2.2 = 0,4(mol)
Ta có :
n Fe / 1 = 0,1 < n HCl / 2 = 0,2 nên HCl dư
b)
n HCl pư = 2n Fe = 0,2(mol) => n HCl dư = 0,4 - 0,2 = 0,2 mol
n FeCl2 = n Fe = 0,1 mol
Vậy :
CM FeCl2 = 0,1/0,2 = 0,5M
CM HCl dư = 0,2/0,2 = 1M
![](https://rs.olm.vn/images/avt/0.png?1311)
Theo de bai ta co
So mol cua chat tan Na can dung la
nNa=\(\dfrac{2,3}{23}=0,1mol\)
\(\Rightarrow\) CM=\(\dfrac{n}{Vdd}=\dfrac{0,1}{0,2}=0,5M\)
![](https://rs.olm.vn/images/avt/0.png?1311)
$n_{NaOH} = 2.1 = 2(mol)$
Sau khi pha, $V_{dd} = \dfrac{2}{0,1} = 20(lít)$
Suy ra :
$V_{H_2O} = 20 - 2 = 18(lít) = 18 000(ml)$
mà $D_{H_2O} = 1(g/ml)$
$\Rightarrow m_{H_2O} = D.V = 18 000(gam)$
$n_{H_2O} = \dfrac{18 000}{18} = 1000(mol)$
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\); nHCl = 0,2.2,5 = 0,5 (mol)
PTHH: Mg + 2HCl --> MgCl2 + H2
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,5}{2}\) => Mg hết, HCl dư
PTHH: Mg + 2HCl --> MgCl2 + H2
0,2--->0,4----->0,2---->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
b) \(\left\{{}\begin{matrix}C_{M\left(HCl.dư\right)}=\dfrac{0,5-0,4}{0,2}=0,5M\\C_{M\left(MgCl_2\right)}=\dfrac{0,2}{0,2}=1M\end{matrix}\right.\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
200ml = 0,2l
\(n_{HCl}=2,5.0,2=0,5\left(mol\right)\)
Pt : \(Mg+2HCl\rightarrow MgCl_2+H_2|\)
1 2 1 1
0,2 0,5 0,2 0,2
a) Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{0,5}{2}\)
⇒ Mg phản ứng hết , HCl dư
⇒ Tính toán dựa vào số mol của Mg
\(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
b) \(n_{MgCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(n_{HCl\left(dư\right)}=0,5-\left(0,2.2\right)=0,1\left(mol\right)\)
\(C_{MMgCl2}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(C_{MddHCl\left(dư\right)}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(^nNaOH=1.0,3=0,3\left(mol\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
mol 0,3 0,3 0,3
a) \(CM_{HCl}=\dfrac{0,3}{0,2}=1,5M\)
b) \(CM_{d^2saupứ}=\dfrac{0,3}{0,3+0,2}=0,6M\)
Chúc bạn học tốt!!!
a) \(n_{NaOH}=0,3.1=0,3\left(mol\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
\(n_{HCl}=n_{NaOH}=0,3\left(mol\right)\)
=> \(x=CM_{HCl}=\dfrac{0,3}{0,2}=1,5M\)
b) \(n_{NaCl}=n_{NaOH}=0,3\left(mol\right)\)
=> \(CM_{NaCl}=\dfrac{0,3}{0,3+0,2}=0,6M\)
\(n_{NaOH}=\dfrac{4}{40}=0.1\left(mol\right)\)
\(n_{NaOH}=0.2\cdot1=0.2\left(mol\right)\)
\(C_{M_{NaOH}}=\dfrac{0.1+0.2}{0.2}=1.5\left(M\right)\)