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\(n_{CaCO_3}=\dfrac{10}{100}=0.1\left(mol\right)\)
\(CaCO_3+H_2SO_4\rightarrow CaSO_4+CO_2+H_2O\)
\(0.1..........0.1................0.1...........0.1\)
\(C_{M_{H_2SO_4}}=\dfrac{0.1}{0.2}=0.5\left(M\right)\)
\(V_{CO_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{CaSO_4}=0.1\cdot136=13.6\left(g\right)\)
a: \(n_{H_2SO_4}=0.25\cdot2=0.5\left(mol\right)\)
\(n_{Al_2O_3}=\dfrac{10.2}{27\cdot2+16\cdot3}=0.1\left(mol\right)\)
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
0,1 0,5
Vì 0,1/1<0,5/3
nên Al2O3 hết, H2SO4 dư
=>Tính theo Al2O3
b:
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
0,1 0,3 0,1
\(m_{H_2SO_4\left(pư\right)}=0.3\cdot98=29.4\left(g\right)\)
\(m_{muối}=0.1\left(54+3\cdot96\right)=34.2\left(g\right)\)
\(n_{HCl}=0,2.0,5=0,1(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{Fe}=n_{FeCl_2}=\dfrac{1}{2}n_{HCl}=0,05(mol)\\ b,m_{Fe}=0,05.56=2,8(g)\\ c,m_{FeCl_2}=0,05.127=6,35(g)\)
nH2SO4= 2.0,05=0,1(mol)
PTHH: 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O
a) nNaOH= 0,1.2=0,2(mol) => mNaOH=0,2.40=8(g)
=>mddNaOH= 8/20%= 40(g)
b) nNa2SO4=nH2SO4=0,1(mol)
=> mNa2SO4=142.0,1=14,2(g)
\(n_{H_2SO_4}=0,1.0,75=0,075mol\\ H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\)
0,075 0,15 0,075 0,15
\(a)m_{K_2SO_4}=0,075.175=13,05mol\)
\(b)H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\\ n_{NaOH}=0,075.2=0,15mol\\ m_{ddNaOH}=\dfrac{0,15.40}{15\%}\cdot100\%=40g\\ V_{ddNaOH}=\dfrac{40}{1,05}=38,1ml\)
\(n_{H_2SO_4}=0,05\cdot3=0,15mol\)
a) \(H_2SO_4+BaCl_2\rightarrow BaSO_4\downarrow+2HCl\)
0,15 0,15 0,15 0,3
\(m_{ctBaCl_2}=0,15\cdot208=31,5\left(g\right)\)
\(m_{BaCl_2thamgia}=\dfrac{31,5}{20\%}\cdot100\%=157,5\left(g\right)\)
b) \(m_{BaSO_4}=0,15\cdot233=34,95\left(g\right)\)
c) \(Ca\left(OH\right)_2+H_2SO_4\rightarrow CaSO_4+2H_2O\)
0,15 0,15
\(m_{ctCa\left(OH\right)_2}=0,15\cdot74=11,1\left(g\right)\)
\(m_{ddCa\left(OH\right)_2}=\dfrac{11,1}{25\%}\cdot100\%=44,4\left(g\right)\)
\(\Rightarrow V_{Ca\left(OH\right)_2}=\dfrac{44,4}{1,15}=38,6\left(ml\right)\)