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nBr2 = 2.0,25 = 0,5 (mol)
PTHH: C2H2 + 2Br2 --> C2H2Br4
0,25<---0,5------>0,25
=> VC2H2 = 0,25.22,4 = 5,6 (l)
mC2H2Br4 = 0,25.346 = 86,5 (g)
\(n_{Br_2}=0,25\cdot2=0,5mol\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,25 0,5 0,25
\(V_{C_2H_2}=0,25\cdot22,4=5,6l\)
\(m_{C_2H_2Br_4}=0,25\cdot346=86,5g\)
C2H2+2Br2->C2H2Br4
0,05-----0,1
n Br2=\(\dfrac{16}{160}\)=0,1 mol
=>VC2H2=0,05.22,4=1,12l
CaC2+2H2O->Ca(OH)2+C2H2
0,05------------------------------0,05
=>m CaC2=0,05.64=3,2g
\(n_{Br_2}=\dfrac{16}{160}=0,1mol\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,05 0,1 ( mol )
\(V_{C_2H_2}=0,05.22,4=1,12l\)
\(CaC_2+2H_2O\rightarrow C_2H_2+Ca\left(OH\right)_2\)
0,05 0,05 ( mol )
\(m_{CaC_2}=0,05.64=3,2g\)
a.\(m_{dd.Br_2\left(tăng\right)}=m_{C_2H_2}=2,6g\)
\(n_{hh}=\dfrac{5,6}{22,4}=0,25mol\)
\(n_{C_2H_2}=\dfrac{2,6}{26}=0,1mol\)
\(\%V_{C_2H_2}=\dfrac{0,1}{0,25}.100=40\%\)
\(\%V_{CH_4}=100\%-40\%=60\%\)
b.\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,1 0,2 ( mol )
\(C_{M\left(dd.Br_2\right)}=\dfrac{0,2}{0,1}=2M\)
\(n_{C_2H_2}=\dfrac{0.224}{22.4}=0.01\left(mol\right)\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
\(0.01.........0.02........0.01\)
\(m_{C_2H_2Br_4}=0.01\cdot346=3.46\left(g\right)\)
\(V_{dd_{Br_2}}=\dfrac{0.02}{2}=0.01\left(l\right)\)
Câu 1:
a) \(n_{C_2H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PTHH: \(2C_2H_2+5O_2\xrightarrow[]{t^o}4CO_2+2H_2O\)
0,05--->0,125
\(\Rightarrow V_{O_2}=0,125.22,4=2,8\left(l\right)\)
b) \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
0,05-->0,1
\(\Rightarrow V=V_{ddBr_2}=\dfrac{0,1}{1}=0,1\left(l\right)\)
Câu 2:
a) \(n_{C_2H_2}=\dfrac{16,8}{26}=\dfrac{42}{65}\left(mol\right)\)
PTHH: \(2C_2H_2+5O_2\xrightarrow[]{t^o}4CO_2+2H_2O\)
\(\dfrac{42}{65}\)----->\(\dfrac{21}{13}\)----->\(\dfrac{84}{65}\)
\(\Rightarrow V_{kk}=5.\dfrac{21}{13}.22,4=\dfrac{2352}{13}\left(l\right)\)
b) \(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O\)
\(\dfrac{84}{65}\)----->\(\dfrac{84}{65}\)
\(\Rightarrow m_{CaCO_3}=m_{kt}=\dfrac{84}{65}.100=\dfrac{1680}{13}\left(g\right)\)