Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, \(n_{CaCO_3}=\dfrac{41,2}{100}=0,412\left(mol\right)\)
PTHH: CaO + H2O → Ca(OH)2
Mol: 0,412 0,412
PTHH: Ca(OH)2 + CO2 → CaCO3 + H2O
Mol: 0,412 0,412 0,412
\(m_{CaO}=0,412.56=23,072\left(g\right)\)
b, \(V_{CO_2}=0,412.22,4=9,2288\left(l\right)\)
\(m_{Na_2CO_3}=100.16,96\%=16,96\left(g\right)\Rightarrow n_{Na_2CO_3}=\dfrac{16,96}{106}=0,16\left(mol\right)\)
\(m_{BaCl_2}=200.10,4\%=20,8\left(g\right)\Rightarrow n_{BaCl_2}=\dfrac{20,8}{208}=0,1\left(mol\right)\)
PTHH: Na2CO3 + BaCl2 → BaCO3 + 2NaCl
Mol: 0,1 0,1 0,2
Ta có: \(\dfrac{0,16}{1}>\dfrac{0,1}{1}\) ⇒ Na2CO3 dư, BaCl2 hết
mdd sau pứ = 100 + 200 = 300 (g)
\(C\%_{ddNaCl}=\dfrac{0,1.58,5.100\%}{300}=1,95\%\)
\(C\%_{ddNa_2CO_3}=\dfrac{\left(0,16-0,1\right).106.100\%}{300}=2,12\%\)
\(CuO\) + \(H_2\)→ \(Cu\) + \(H_2O\)
\(O_2\) + \(2H_2\) → \(2H_2O\)
\(PbO\) + \(H_2\) → \(H_2O\) + \(Pb\)
\(Fe_2O_3\) + \(3H_2\) → \(2Fe\) + \(3H_2O\)
\(Fe_3O_4\) + \(4H_2\) → \(3Fe\) + \(4H_2O\)
\(HgO\) + \(H_2\) → \(Hg\) + \(H_2O\)
Câu 4:
4.1/ Ta có: \(n_{NaCl}=2,5.0,4=1\left(mol\right)\)
\(\Rightarrow m_{NaCl}=1.58,5=58,5\left(g\right)\)
4.2/ Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
_____0,2___________0,2____0,2 (mol)
b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
Bạn tham khảo nhé!
\(\dfrac{2A}{2A+16.5}=\dfrac{43,66}{100}\)
=> \(200A=43,66.\left(2A+16.5\right)\)
=> \(200A-87,32A=3492,8\)
=> \(112,68A=3492,8\)
=> A= 31