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a)\(CaSO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
tl 1..................2............1.............1..........1(mol)
br0,125........0,25......0,125........0,125....0,125(mol)
\(m_{CaSO_3}=\dfrac{15}{120}=0,125\left(mol\right)\)
\(\Rightarrow VddHCl=\dfrac{n}{C_M}=\dfrac{0,25}{1}=0,25\left(l\right)\)
\(\Rightarrow C_{MCaCl_2}=\dfrac{0,125}{0,25}=0,5\left(M\right)\)
Câu 1 :
\(n_{Na2CO3}=\dfrac{10,6}{106}=0,1\left(mol\right)\)
Pt : \(Na_2CO_3+H_2SO_4\rightarrow Na_2SO_4+CO_2+H_2O|\)
1 1 1 1 1
0,1 0,1 0,1 0,1
a) \(n_{H2SO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(V_{ddH2SO4}=\dfrac{0,1}{1}=0,1\left(l\right)\)
b) \(n_{CO2}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(V_{CO2\left(dktc\right)}=0,1.22,4=2,24\left(l\right)\)
c) \(n_{Na2SO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(C_{M_{Na2SO4}}=\dfrac{0,1}{0,1}=1\left(M\right)\)
Chúc bạn học tốt
a) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 6HCl → 2AlCl3 + 3H2O
Mol: 0,1 0,6 0,2
\(m_{ddHCl}=\dfrac{0,6.36,5.100}{14,6}=150\left(g\right)\)
b) mdd sau pứ = 16 + 150 = 166 (g)
\(C\%_{ddFeCl_3}=\dfrac{0,2.162,5.100\%}{166}=19,58\%\)
\(n_{Al}=\dfrac{10,8}{27}=0,4(mol)\\ a,2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ \Rightarrow n_{H_2}=n_{H_2SO_4}=0,6(mol);n_{Al_2(SO_4)_3}=0,2(mol)\\ b,V_{H_2}=0,6.22,4=13,44(l)\\ c,m_{dd_{H_2SO_4}}=\dfrac{0,6.98}{9,8\%}=600(g)\\ \Rightarrow C\%_{Al_2(SO_4)_3}=\dfrac{0,2.342}{10,8+600-0,6.2}.100\%=11,22\%\)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,4--->0,8------>0,4--->0,4
=> VH2 = 0,4.22,4 = 8,96(l)
c) mHCl = 0,8.36,5 = 29,2 (g)
=> \(m_{dd\left(HCl\right)}=\dfrac{29,2.100}{7,3}=400\left(g\right)\)
mdd (sau pư) = 22,4 + 400 - 0,4.2 = 421,6 (g)
=> \(C\%\left(FeCl_2\right)=\dfrac{127.0,4}{421,6}.100\%=12,05\%\)
Bài 2 :
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH :
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
0,1 0,3 0,1 0,3
\(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)
\(b,V_{ddH_2SO_4}=\dfrac{0,3}{2}=0,15\left(l\right)\)
\(c,C_{M\left(Fe_2\left(SO_4\right)_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}\left(M\right)\)
Bài 3 :
\(n_{Mg}=\dfrac{4.8}{24}=0,2\left(mol\right)\)
PTHH :
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2O\)
0,2 0,2 0,2 0,2
\(m_{MgSO_4}=0,2.120=24\left(g\right)\)
\(V_{H_2}=0,2.24,79=4,958\left(l\right)\)
\(c,C_{M\left(H_2SO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(d,C_{M\left(MgSO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Bài 4 :
\(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
PTHH :
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
0,3 0,45 0,15 0,45
\(V_{H_2}=0,45.24,79=11,1555\left(l\right)\)
\(m_{H_2SO_4}=0,45.98=44,1\left(g\right)\)
\(C\%_{H_2SO_4}=\dfrac{44,1}{300}.100\%=14,7\%\)
\(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)
\(m_{dd}=8,1+300-\left(0,45.2\right)=307,2\left(g\right)\)
\(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{51,3}{307,2}.100\%\approx16,7\%\)
Bài 5 :
\(n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)
PTHH:
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,2 0,4 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(C_{M\left(HCl\right)}=\dfrac{0,4}{0,2}=2\left(M\right)\)
\(C_{M\left(FeCl_2\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
PT: \(H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\)
Ta có: \(n_{H_2SO_4}=0,25.1=0,25\left(mol\right)\)
a, Theo PT: \(n_{NaOH}=2n_{H_2SO_4}=0,5\left(mol\right)\Rightarrow V_{NaOH}=\dfrac{0,5}{2}=0,25\left(l\right)\)
b, Theo PT: \(n_{Na_2SO_4}=n_{H_2SO_4}=0,25\left(mol\right)\)
\(\Rightarrow C_{M_{Na_2SO_4}}=\dfrac{0,25}{0,25+0,25}=0,5\left(M\right)\)
\(a,n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\\ PTHH:Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
\(b,\) Theo PT: \(n_{H_2}=n_{Mg}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2\left(đktc\right)}=0,3\cdot22,4=6,72\left(l\right)\)
\(c,n_{H_2SO_4}=n_{Mg}=0,3\left(mol\right)\\ \Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,3}{0,2}=1,5M\)
Bài 3 : Trích mẫu thử :
Cho dung dịch BaCl2 vào 2 mẫu thử :
+ Chất nào xuất hiện kết tủa trắng không tan trong axit : H2SO4
Pt : \(BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\)
Không hiện tượng : HCl
Chúc bạn học tốt
Bài 2 :
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)
1 1 1 1
0,2 0,2 0,2 0,2
a) \(n_{H2SO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{ddH2SO4}=\dfrac{0,2}{1}=0,2\left(l\right)\)
b) \(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
c) \(n_{FeSO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
'\(C_{M_{FeSO4}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Chúc bạn học tốt