Question

Giúp mình c27,c29

Answer 1

Câu 29: B

\(2Al^0+6H^{+1}Cl\rightarrow2Al^{+3}Cl_3+3H_2^0\)

Answer 2

Câu 27: 

\(n_{hh}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)

\(n_{O_2}=a\left(mol\right)\)

\(n_{Cl_2}=b\left(mol\right)\)

\(n_{Mg}=0.1\left(mol\right)\)

\(n_{Al}=0.2\left(mol\right)\)

\(\text{Bảo toàn e : }\)

\(4a+2b=0.1\cdot2+0.2\cdot3=0.8\)

\(a+b=0.3\)

\(\Rightarrow a=0.1,b=0.2\)

\(V_{O_2}=0.1\cdot22.4=2.24\left(l\right)\)

Answer 3

Câu 30: Chọn A

\(HCl+NaOH\rightarrow H_2O+NaCl\)

\(n_{NaOH}=n_{HCl}=0,2.0,2=0,04\left(mol\right)\)

\(V_{ddNaOH}=\dfrac{0,04}{0,5}=0,08\left(l\right)=80\left(ml\right)\)