Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Ta có: \(n_{H_2}=\dfrac{10,08}{22,4}=0,45\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
a, \(n_{Fe}=n_{H_2}=0,45\left(mol\right)\Rightarrow m_{Fe}=0,45.56=25,2\left(g\right)\)
b, \(n_{HCl}=2n_{H_2}=0,9\left(mol\right)\) \(\Rightarrow C_{M_{HCl}}=\dfrac{0,9}{0,15}=6\left(M\right)\)
c, \(FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl\)
\(4Fe\left(OH\right)_2+O_2\underrightarrow{t^o}2Fe_2O_3+4H_2O\)
Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_2}=\dfrac{1}{2}n_{FeCl_2}=\dfrac{1}{2}n_{H_2}=0,225\left(mol\right)\)
\(\Rightarrow m_{Fe_2O_3}=0,225.160=36\left(g\right)\)
a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)
Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,4\left(mol\right)\Rightarrow m_{Al}=0,4.27=10,8\left(g\right)\)
b, \(n_{HCl}=2n_{H_2}=1,2\left(mol\right)\Rightarrow C\%_{HCl}=\dfrac{1,2.36,5}{250}.100\%=17,52\%\)
c, m dd sau pư = 10,8 + 250 - 0,6.2 = 259,6 (g)
d, \(n_{AlCl_3}=\dfrac{2}{3}n_{H_2}=0,4\left(mol\right)\)
\(\Rightarrow C\%_{AlCl_3}=\dfrac{0,4.133,5}{259,6}.100\%\approx20,57\%\)
a+b) PTHH: \(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
Ta có: \(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,2\left(mol\right)\\n_{CO_2}=0,1\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{HCl}=0,2\cdot36,5=7,3\left(g\right)\\V_{CO_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)
c) Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=0,1\left(mol\right)\\n_{NaOH}=\dfrac{50\cdot40\%}{40}=0,5\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\) Tạo muối trung hòa, bazơ dư, tính theo CO2
Bảo toàn Cacbon: \(n_{Na_2CO_3}=n_{CO_2}=0,1\left(mol\right)\) \(\Rightarrow m_{Na_2CO_3}=0,1\cdot106=10,6\left(g\right)\)
\(a,n_{\left(CH_3COO\right)_2Mg}=\dfrac{7,1}{142}=0,05\left(mol\right)\)
PTHH: \(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\uparrow\)
0,1<----------------0,05-------------->0,05
\(\rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\\ b,C\%_{CH_3COOH}=\dfrac{0,1.60}{100}.100\%=6\%\)
\(c,n_{C_2H_5OH}=\dfrac{6,9}{46}=0,15\left(mol\right)\)
PTHH: \(CH_3COOH+C_2H_5OH\xrightarrow[H_2SO_{4\left(đặc\right)}]{t^o}CH_3COOC_2H_5+H_2O\)
bđ 0,1 0,15
pư 0,1 0,1
spư 0 0,05 0,1
\(\rightarrow m_{este}=0,1.80\%.88=7,04\left(g\right)\)
\(a,n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{Mg}=n_{MgCl_2}=n_{H_2}=0,4\left(mol\right)\\ n_{HCl}=2.0,4=0,8\left(mol\right)\\ a,m_{HCl}=0,8.36,5=29,2\left(g\right)\\ b,m_{ddHCl}=\dfrac{29,2}{10\%}=292\left(g\right)\\ m_{ddsau}=0,4.24+292-0,4.2=300,8\left(g\right)\\ C\%_{ddMgCl_2}=\dfrac{0,4.95}{300,8}.100\approx12,633\%\)
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(n_{H_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=0,3\left(mol\right)\Rightarrow m_{Fe}=0,3.56=16,8\left(g\right)\)
b, \(n_{H_2SO_4}=n_{H_2}=0,3\left(mol\right)\Rightarrow C\%_{H_2SO_4}=\dfrac{0,3.98}{120}.100\%=24,5\%\)
c, m dd sau pư = 16,8 + 120 - 0,3.2 = 136,2 (g)
d, \(n_{FeSO_4}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow C\%_{FeSO_4}=\dfrac{0,3.152}{136,2}.100\%\approx33,48\%\)
Ta có: \(n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1\left(mol\right)\)
a. PTHH: Na2SO3 + 2HCl ---> 2NaCl + SO2 + H2O
Theo PT: \(n_{SO_2}=n_{Na_2CO_3}=0,1\left(mol\right)\)
=> \(V_{SO_2}=0,1.22,4=2,24\left(lít\right)\)
b. Theo PT: \(n_{HCl}=2.n_{SO_2}=2.0,1=0,2\left(mol\right)\)
=> \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
=> \(C_{\%_{HCl}}=\dfrac{7,3}{150}.100\%=4,87\%\)
c. Ta có: \(m_{dd_{NaCl}}=n_{Na_2SO_{3_{PỨ}}}=50\left(g\right)\)
Theo PT: \(n_{NaCl}=n_{HCl}=0,2\left(mol\right)\)
=> \(m_{NaCl}=0,2.58,5=11,7\left(g\right)\)
=> \(C_{\%_{NaCl}}=\dfrac{11,7}{50}.100\%=23,4\%\)
\(a,n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1mol\\ Na_2SO_3+2HCl\rightarrow2NaCl+SO_2+H_2O\\ n_{SO_2}=n_{Na_2SO_4}=0,1mol\\ V_{SO_2}=0,1.22,4=2,24l\\ b,n_{HCl}=0,1.2=0,2mol\\ C_{M_{HCl}}=\dfrac{0,2}{0,15}=\dfrac{4}{3}M\\ c,n_{NaOH}=\dfrac{40.10}{100.40}=0,1mol\\ T=\dfrac{0,1}{0,1}=1\\ \Rightarrow Tạo,NaHSO_3\\ NaOH+SO_2\rightarrow NaHSO_3\\ m_{NaHSO_3}=0,1.64+0,1.40=10,4g\)