Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{SO_2}=\dfrac{11,2}{22,4}=0,5mol\\ n_{Ca\left(OH\right)_2}=0,2.0,5=0,1mol\\ SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3+H_2O\\ \Rightarrow\dfrac{0,5}{1}>\dfrac{0,1}{1}\Rightarrow SO_2.dư\\ n_{SO_2.pứ}=n_{Ca\left(OH\right)_2}=0,1mol\\ m_{SO_2.dư}=\left(0,5-0,1\right).64=25,6g\)
nCa(OH)2 = 0,15(mol)
nSO2=0,2(mol)
Ta có: 1< nCa(OH)2/nSO2<2
=> Sp thu được hh 2 muối CaSO3 và Ca(HSO3)2
PTHH: Ca(OH)2 + SO2 -> CaSO3 + H2O (1)
CaSO3 + SO2 + H2O -> Ca(HSO3)2 (2)
Ta có: nSO2(2)= 0,2-0,15=0,05(mol)
=> nCaSO3(2)=0,05(mol)
nCaSO3(1)=nCa(OH)2=0,15(mol)
=>m(kết tủa)= mCaSO3(còn)= (0,15-0,05).120=12(g)
=> Chọn B
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 :
\(a+b=0.04\)
\(a+2b=0.05\)
\(\Rightarrow\left\{{}\begin{matrix}a=0.03\\b=0.01\end{matrix}\right.\)
\(m_{BaCO_3}=0.03\cdot197=5.91\left(g\right)\)
\(n_{SO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ PTHH:SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3\downarrow+H_2O\\ \Rightarrow n_{CaSO_3}=n_{SO_2}=0,1\left(mol\right)\\ \Rightarrow m_{CaSO_3}=120\cdot0,1=12\left(g\right)\)
\(n_{SO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: SO2 + Ca(OH)2 → CaSO3 + H2O
Mol: 0,1 0,1
\(m_{CaSO_3}=0,1.120=12\left(g\right)\)
\(a.n_{CO_2}=\dfrac{0,672}{22,4}=0,03mol\\ CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)
\(n_{CO_2}=n_{Ca\left(OH\right)_2}=n_{CaCO_3}=0,03mol\\ m_{CaCO_3}=0,03.100=3g\\ b.V_{ddCa\left(OH\right)_2}=\dfrac{0,03}{1,5}=0,02l\)
\(n_{SO_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
\(m_{Ca\left(OH\right)_2}=740.10\%=74\left(g\right)\Rightarrow n_{Ca\left(OH\right)_2}=\dfrac{74}{74}=1\left(mol\right)\)
PTHH: SO2 + Ca(OH)2 → CaSO3 + H2O
Mol: 0,5 0,5
Ta có: \(\dfrac{0,5}{1}< \dfrac{1}{1}\)⇒ SO2 hết, Ca(OH)2 dư
\(m_{CaSO_3}=0,5.120=60\left(g\right)\)
\(n_{SO_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ n_{Ca\left(OH\right)_2}=\dfrac{740.10\%}{74}=1\left(mol\right)\\ Vì:\dfrac{n_{SO_2}}{n_{Ca\left(OH\right)_2}}=\dfrac{0,5}{1}=0,5< 1\\ \Rightarrow Sp:CaSO_3,Ca\left(OH\right)_2dư\\ Ca\left(OH\right)_2+SO_2\rightarrow CaSO_3+H_2O\\ n_{CaSO_3}=n_{SO_2}=0,5\left(mol\right)\\ m_{tủa}=m_{CaSO_3}=0,5.120=60\left(g\right)\)