Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, \(n_{KOH}=0,3.1=0,3\left(mol\right)\)
PT: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Theo PT: \(n_{K_2SO_4}=\dfrac{1}{2}n_{KOH}=0,15\left(mol\right)\)
\(\Rightarrow m_{K_2SO_4}=0,15.174=26,1\left(g\right)\)
b, \(C_{M_{K_2SO_4}}=\dfrac{0,3}{0,3+0,2}=0,6\left(M\right)\)
nK2SO3=15.8\158=0.1(mol)
K2SO3+H2SO4→K2SO4+SO2+H2O
0.1...........................0.1..........0.1
VSO2=0.1⋅22.4=2.24(l)
CMK2SO4=0.1\0.2=0.5(M)
200ml = 0,2l
\(n_{KOH}=1.0,2=0,2\left(mol\right)\)
Pt : \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O|\)
2 1 1 2
0,2 0,1
\(n_{H2SO4}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{H2SO4}=0,1.98=9,8\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{9,8.100}{49}=20\)0/0
Chúc bạn học tốt
200ml = 0,2l
\(n_{KOH}=1.0,2=0,2\left(mol\right)\)
Pt : \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O|\)
2 1 1 2
0,2 0,1
\(n_{H2SO4}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{H2SO4}=0,1.98=9,8\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{9,8.100}{49}=20\)0/0
Chúc bạn học tốt
a, \(H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\)
b, \(n_{KOH}=0,12.0,4=0,048\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=\dfrac{1}{2}n_{KOH}=0,024\left(mol\right)\)
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,024}{0,08}=0,3\left(M\right)\)
c, \(n_{K_2SO_4}=\dfrac{1}{2}n_{KOH}=0,024\left(mol\right)\)
\(\Rightarrow C_{M_{K_2SO_4}}=\dfrac{0,024}{0,08+0,12}=0,12\left(M\right)\)
\(n_{K_2O}=\dfrac{23,5}{94}=0,25\left(mol\right)\\ PTHH:K_2O+H_2O\rightarrow2KOH\\ \Rightarrow n_{KOH}=2n_{K_2O}=0,5\left(mol\right)\\ \Rightarrow C_{M_{KOH}}=\dfrac{0,5}{0,2}=2,5M\\ PTHH:2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\\ \Rightarrow n_{H_2SO_4}=\dfrac{1}{2}n_{KOH}=0,25\left(mol\right)\\ \Rightarrow m_{CT_{H_2SO_4}}=0,25\cdot98=24,5\left(g\right)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{24,5\cdot100\%}{49\%}=50\left(g\right)\)
PTHH:\(CaO+H_2SO_4\rightarrow CaSO_4+H_2O \)
tl 1 : 1 : 1 : 1 (mol)
br \(\dfrac{1}{7}\) -> \(\dfrac{1}{7}\)
n\(_{CaO}=\dfrac{8}{56}=\dfrac{1}{7}\left(mol\right)\)
Đổi 200ml=0,2l
=>\(C_{MH_2SO_4}=\dfrac{\dfrac{1}{7}}{0,2}=\dfrac{5}{7}\left(M\right)\)
\(n_{CaO}=\dfrac{m}{M}=\dfrac{8}{56}=0,14\left(mol\right)\)
PTHH:\(CaO+H_2SO_4\rightarrow CaSO_4+H_2O\)
0,14 0,14
\(CM=\dfrac{n_{ct}}{V_{dd}}=\dfrac{0,14}{0,2}=0,7\left(M\right)\)