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a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right);n_{H_2SO_4}=0,1.0,5=0,05\left(mol\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Theo đề:0,2......0,05
Lập tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,05}{3}\)=> Al dư, H2SO4 hết
=> \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
=> Chọn C
b) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2SO_4}=\dfrac{0,05}{3}=\dfrac{1}{60}\left(mol\right)\)
=> \(C_{M\left(Al_2\left(SO_4\right)_3\right)}=\dfrac{1}{\dfrac{60}{0,1}}==0,17M\)
=> Chọn A
\(a.\)
\(n_C=\dfrac{9.6}{12}=0.8\left(mol\right)\)
\(n_{O_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(C+O_2\underrightarrow{^{t^0}}CO_2\)
\(0.05...0.05..0.05\)
\(\Rightarrow Cdư\)
\(V_{CO_2}=0.05\cdot22.4=1.12\left(l\right)\)
\(b.\)
\(n_P=\dfrac{6.2}{31}=0.2\left(mol\right)\)
\(n_{O_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(4P+5O_2\underrightarrow{^{t^0}}2P_2O_5\)
\(0.04....0.05......0.02\)
\(\Rightarrow Pdư\)
\(m_{P_2O_5}=0.02\cdot142=2.84\left(g\right)\)
a, \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(n_{O_2}=\dfrac{8,4}{22,4}=0,375\left(mol\right)\)
PT: \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
Xét tỉ lệ: \(\dfrac{0,25}{2}< \dfrac{0,375}{1}\), ta được O2 dư.
Theo PT: \(n_{O_2\left(pư\right)}=\dfrac{1}{2}n_{H_2}=0,125\left(mol\right)\Rightarrow n_{O_2\left(dư\right)}=0,375-0,125=0,25\left(mol\right)\)
\(\Rightarrow V_{O_2\left(dư\right)}=0,25.22,4=5,6\left(l\right)\)
b, Theo PT: \(n_{H_2O}=n_{H_2}=0,25\left(mol\right)\Rightarrow m_{H_2O}=0,25.18=4,5\left(g\right)\)
Na2O: natri oxit - oxit bazơ
CO2: cacbon đioxit - oxit axit
Na2SO4: natri sunfat - muối trung hòa
HNO3: axit nitric - axit
Mg(OH)2: magie hiđroxit - bazơ
Ba(HCO3)2 : bari hiđrocacbonat - muối axit
Ca3(PO4)2: canxi photphat - muối trung hòa
H2SO3: axit sunfurơ - axit
P2O5: điphotpho pentaoxit - oxit axit
H3PO4: axit photphoric - axit
Fe(OH)3: sắt hiđroxit - bazơ
CuO: đồng (II) oxit - oxit bazơ
AgNO3: Bạc nitrat - muối trung hòa
K2CO3: kali cacbonat - muối trung hòa
a.\(C\%_{KCl}=\dfrac{20}{600}.100=3,33\%\)
b.2,5kg = 2500g
\(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{34,2}{2500}.100=1,368\%\)
\(n_{H_2}=0,3\left(mol\right);n_{O_2}=0,75\left(mol\right);n_{N_2}=0,8\left(mol\right);n_{CO_2}=0,15\left(mol\right)\)
a) \(\Sigma n=0,3+0,75+0,8+0,15=2\left(mol\right)\)
\(\%n_{H_2}=\dfrac{0,3}{2}.100=15\%\)
\(\%n_{O_2}=\dfrac{0,75}{2}.100=37,5\%\)
\(\%n_{N_2}=\dfrac{0,8}{2}.100=40\%\)
\(\%n_{CO_2}=\dfrac{0,15}{2}.100=7,5\%\)
b) \(\overline{M}_X=\dfrac{m_X}{n_X}=\dfrac{0,3.2+0,75.32+0,8.28+0,15.44}{2}=26,8\)(g/mol)
dX/SO2=\(\dfrac{26,8}{64}=0,41875\)
dX/H2S=\(\dfrac{26,8}{34}=0,788\)
dX/NO2=\(\dfrac{26,8}{46}=0,582\)
dX/NO=\(\dfrac{26,8}{30}=0,893\)