Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Câu 4 :
\(n_{Fe2O3}=\dfrac{24}{160}=0,15\left(mol\right)\)
Pt : \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O|\)
1 3 1 3
0,15 0,15
a) \(n_{Fe2\left(SO4\right)3}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
⇒ \(m_{Fe2\left(SO4\right)3}=0,15.400=60\left(g\right)\)
b) \(C_{M_{Fe2\left(SO4\right)3}}=\dfrac{0,15}{0,5}=0,3\left(M\right)\)
Chúc bạn học tốt
a,\(n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\)
PTHH: Fe2O3 + 3H2SO4 → Fe2(SO4)3 + 3H2O
Mol: 0,15 0,45 0,15
\(m_{Fe_2\left(SO_4\right)_3}=0,15.400=60\left(g\right)\)
b,\(C_{M_{ddFe_2\left(SO_4\right)_3}}=\dfrac{0,15}{0,5}=0,3\left(mol\right)\)
Bài 8:
a). 2NaOH + H2SO4 → Na2SO4 + 2H2O
2 1 1 2
0,6 0,3 0,3 0,6
200ml = 0,2l
nH2SO4= CM . V = 1,5 . 0,2 = 0,3 (mol)
nNaOH = \(\dfrac{0,3.2}{1}\)= 0,6(mol)
mNaOH= n . M = 0,6 . 40 = 24(g)
⇒ mddNaOH = \(\dfrac{m_{ct}.100\%}{C\%}\)= \(\dfrac{24.100\%}{20\%}\)= 120(g).
b). Ta có: mH2SO4= n . M = 0,3 . 98 =29,4(g).
mH2O = n . M = 0,6 . 18 = 10,8 (g).
Ta lại có: mddNa2SO4 = mddNaOH + mH2SO4 - mH2O
= 120 + 29,4 - 10,8
= 138,6(g).
mctNa2SO4= n . M = 0,3 . 142 = 42,6(g)
C%Na2SO4 = \(\dfrac{m_{ct}}{m_{dd}}\).100%=\(\dfrac{42,6}{138,6}\).100% ∼ 30,74%
Bài 9:
Đặt công thức oxit của KL là RO
RO + 2HCl → RCl2 + H2O
Ta có: mHCl =\(\dfrac{600.3,65}{100\%}\)= 21,9(g)
⇒nHCl = \(\dfrac{21,9}{36,5}\)= 0,6(mol).
Từ PT trên, có: nRO = \(\dfrac{1}{2}\)nHCl =0,3(mol)
2,4 : (R+16) =0,3
tự bấm ra kq nhé, bị bắt đi ngủ r:) thông cảm ạ
Câu 7:
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
b, \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,1.56}{10}.100\%=56\%\\\%m_{CuO}=44\%\end{matrix}\right.\)
c, \(n_{CuO}=\dfrac{10-0,1.56}{80}=0,055\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=n_{Fe}+n_{CuO}=0,155\left(mol\right)\)
\(\Rightarrow C\%_{H_2SO_4}=\dfrac{0,155.98}{100}.100\%=15,19\%\)
d, Theo PT: \(\left\{{}\begin{matrix}n_{FeSO_4}=n_{Fe}=0,1\left(mol\right)\\n_{CuSO_4}=n_{CuO}=0,055\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{FeSO_4}=0,1.152=15,2\left(g\right)\\m_{CuSO_4}=0,055.160=8,8\left(g\right)\end{matrix}\right.\)
Câu 8:
a, \(CuCO_3+2HCl\rightarrow CuCl_2+CO_2+H_2O\)
b, \(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{CuCO_3}=n_{CO_2}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuCO_3}=\dfrac{0,15.124}{20}.100\%=93\%\\\%m_{CuCl_2}=7\%\end{matrix}\right.\)
c, \(n_{HCl}=2n_{CO_2}=0,3\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)
\(5.a.V_{rượu}=\dfrac{46.25}{100}=11,5\left(l\right)\\ m_{rượu}=11,5.0,8=9,2\left(g\right)\\ b.C_2H_5OH+CH_3COOH⇌CH_3COOC_2H_5+H_2O\\n_{C_2H_5OH}=\dfrac{9,2}{46}=0,2\left(mol\right)\\ n_{CH_3COOC_2H_5}=n_{C_2H_5OH}=0,2\left(mol\right)\\ \Rightarrow m_{CH_3COOC_2H_5}=0,2.88=17,6\left(g\right)\\ VìH=30\%\Rightarrow m_{CH_3COOC_2H_5}=17,6.30\%=5,28\left(g\right)\)
\(6.a.C_2H_5OH+CH_3COOH⇌CH_3COOC_2H_5+H_2O\\ n_{C_2H_5OH}=\dfrac{23}{46}=0,5\left(mol\right)\\ n_{CH_3COOH}=0,5.60=30\left(g\right)\\ b.n_{CH_3COOC_2H_5}=n_{C_2H_5OH}=0,5\left(mol\right)\\ \Rightarrow m_{CH_3COOC_2H_5}=0,5.88=44\left(g\right)\\ VìH=70\%\Rightarrow m_{CH_3COOC_2H_5}=44.70\%=30,8\left(g\right)\)
Bài 1 :
\((1) C_2H_4 + H_2O \xrightarrow{t^o,H^+} C_2H_5OH\\ (2) C_2H_5OH + O_2 \xrightarrow{men\ giấm} CH_3COOH + H_2O\\ (3) CH_3COOH + NaOH \to CH_3COONa + H_2O\\ (4) 2C_2H_5OH + 2Na \to 2C_2H_5ONa + H_2\)
Bài 2 :
\((1) C + O_2 \xrightarrow{t^o} CO_2\\ (2) Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O\\ (3) CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O\\ (4) 2NaOH + CO_2 \to Na_2CO_3 + H_2O\)
Giải giupz em bài 3 với ạ