Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)
Gọi \(n_{SO_2} = n_{CO_2} = a(mol)\\ n_{CO} = b(mol)\)
Ta có :
\(M_A = \dfrac{m_{CO}+m_{CO_2} + m_{SO_2}}{n_{CO} + n_{CO_2} + n_{SO_2}}\)
⇔ \(\dfrac{28b+ 44a + 64a}{b + a + a} = 20,5.2\)
⇔ 108a + 28b = 41b + 82a
⇔ 26a = 13b
⇔ \(\dfrac{a}{b} = \dfrac{13}{26} = \dfrac{1}{2}\)
Suy ra : Nếu thể tích khí A được chia làm 4 phần thì CO chiếm 2 phần , CO2 và SO2 chiếm 1 phần
\(\%V_{CO_2} = \%V_{SO_2} = \dfrac{1}{4}.100\% = 25\%\\ \%V_{SO_2} = \dfrac{2}{4}.100\% = 50\%\)
b)
Ta có :
\(n_{CO_2} + n_{SO_2} = n_A.50\% = \dfrac{2,24}{22,4}.50\% = 0,05(mol)\)
\(2NaOH + CO_2 \to Na_2CO_3 + H_2O\\ 2NaOH + SO_2 \to Na_2SO_3 + H_2O\)
Theo PTHH :
\(n_{NaOH} = 2(n_{SO_2} + n_{CO_2}) = 0,1(mol)\\ \Rightarrow V_{NaOH} = \dfrac{0,1}{1} = 0,1(lít)\)
Đặt \(n_{O_2}=x;n_{CO_2}=y\)
\(n_X=\dfrac{4,48}{22,4}=0,2\left(mol\right)\Leftrightarrow x+y=0,2\)
Ta có: \(16x+44y=\left(x+y\right).18.2\)
\(\Leftrightarrow2y=5x\)
\(\Leftrightarrow\dfrac{y}{5}=\dfrac{x}{2}\)
Mà x+y=0,2
\(\Rightarrow\dfrac{y}{5}=\dfrac{x}{2}=\dfrac{x+y}{5+2}=\dfrac{0,2}{7}=0,0286\)
\(\Rightarrow y=5.0,0286=0,143\left(mol\right);x=0,2-0,143=0,057\left(mol\right)\)
PTHH:
\(Zn+H_2SO_4--->ZnSO_4+H_2\)
\(Cu+H_2SO_4--\times-->\)
a. Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,1.65=6,5\left(g\right)\)
\(\Rightarrow\%_{m_{Zn}}=\dfrac{6,5}{19,3}.100\%=33,7\%\)
\(\%_{m_{Cu}}=100\%-33,7\%=66,3\%\)
b. Theo PT: \(n_{H_2SO_4}=n_{Zn}=0,1\left(mol\right)\)
Đổi 200ml = 0,2 lít
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,1}{0,2}=0,5M\)
c. Ta có: \(V_{dd_{ZnSO_4}}=V_{dd_{H_2SO_4}}=0,2\left(lít\right)\)
Theo PT: \(n_{ZnSO_4}=n_{Zn}=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{ZnSO_4}}=\dfrac{0,1}{0,2}=0,5M\)
1.
\(n_{CO_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(n_{Ca\left(OH\right)_2}=0.075\left(mol\right)\)
\(T=\dfrac{0.1}{0.075}=1.33\)
=> Tạo ra 2 muối
\(n_{CaCO_3}=a\left(mol\right),n_{Ca\left(HCO_3\right)_2}=b\left(mol\right)\)
Khi đó :
\(a+b=0.075\)
\(a+2b=0.1\)
\(\Rightarrow\left\{{}\begin{matrix}a=0.05\\b=0.025\end{matrix}\right.\)
\(m_{sp}=0.05\cdot100+0.025\cdot162=9.05\left(g\right)\)
2.
\(n_{CO_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(n_{Ba\left(OH\right)_2}=0.2\cdot0.2=0.04\left(mol\right)\)
\(T=\dfrac{0.005}{0.04}=1.25\)
=> Tạo ra 2 muối
\(n_{BaCO_3}=a\left(mol\right),n_{Ba\left(HCO_3\right)_2}=b\left(mol\right)\)
Ta có :
\(a+b=0.04\)
\(a+2b=0.05\)
\(\Rightarrow\left\{{}\begin{matrix}a=0.03\\b=0.01\end{matrix}\right.\)
\(m_{BaCO_3}=0.03\cdot197=5.91\left(g\right)\)
Vì Cu không tác dụng với HCl
\(n_{H2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,1 0,2 0,1
a) \(n_{Fe}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(m_{Fe}=0,1.56=5,6\left(g\right)\)
\(m_{Cu}=12-5,6=6,4\left(g\right)\)
b) \(n_{HCl}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
200ml = 0,2l
\(C_{M_{ddHCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
c) 0/0Fe = \(\dfrac{5,6.100}{12}=46,67\)0/0
0/0Cu = \(\dfrac{6,4.100}{12}=53,33\)0/0
Chúc bạn học tốt
Gọi số mol CO2 và SO2 là a, b (mol)
= >\(\left\{{}\begin{matrix}n_{khí}=a+b=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\\dfrac{44a+64b}{a+b}=29,5.2=59\end{matrix}\right.\) => \(\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,3\left(mol\right)\end{matrix}\right.\)
\(n_{NaOH}=1.0,4=0,4\left(mol\right)\)
PTHH: NaOH + CO2 --> NaHCO3
________0,1<----0,1------->0,1_______(mol)
NaOH + SO2 --> NaHSO3
_0,3<----0,3-------->0,3_____________(mol)
=> \(\left\{{}\begin{matrix}C_{M\left(NaHCO_3\right)}=\dfrac{0,1}{0,4}=0,25M\\C_{M\left(NaHSO_3\right)}=\dfrac{0,3}{0,4}=0,75M\end{matrix}\right.\)
\(a.m_{CO_2}=3.44=132\left(g\right)\\ m_{CO}=2.28=56\left(g\right)\\b. m_{SO_2}=0,1.64=64\left(g\right)\\ m_{O_2}=0,05.32=16\left(g\right)\)
thx u very much...friend :3