Câu 10 :
\(m_{ddH2SO4}=1,12.175=196\left(g\right)\)
\(m_{ct}=\dfrac{10.196}{100}=19,6\left(g\right)\)
\(n_{H2SO4}=\dfrac{19,6}{98}=0,2\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
\(\dfrac{2}{15}\) 0,2 \(\dfrac{1}{15}\) 0,15
a) \(n_{Al}=\dfrac{0,2.2}{3}=\dfrac{2}{15}\left(mol\right)\)
⇒ \(m_{Al}=\dfrac{2}{15}.27=3,6\left(g\right)\)
b) \(n_{AlCl3}=\dfrac{0,2.1}{3}=\dfrac{1}{15}\left(mol\right)\)
175ml = 0,175l
\(C_{M_{AlCl3}}=\dfrac{\dfrac{1}{15}}{0,175}=0,38\left(M\right)\)
\(n_{H2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(m_{ddspu}=3,6+196-\left(0,15.2\right)=199,3\left(g\right)\)
\(C_{AlCl3}=\dfrac{\dfrac{1}{15}.133,5.100}{199,3}=4,47\)0/0
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Câu 11 :
\(n_{H2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)
1 1 1 1
0,1 0,1
\(n_{Fe}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(m_{Fe}=0,1.56=5,6\left(g\right)\)
\(m_{Cu}=12-5,6=6,4\left(g\right)\)
0/0Cu = \(\dfrac{6,4.100}{12}=53,33\)0/0
⇒ Chọn câu : B
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