Question

Bài 6:Hòa tan m (g) Al trong V ml dung dịch HCl 2M,thu được muối AlCl₃  và thấy có 7.437 lít khí hydrogen thoát ra(đkc)

a.Viết PTHH xảy ra

b.Tính m

c.Tính V

Answer 1

a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

b, \(n_{H_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\)

Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\Rightarrow m_{Al}=0,2.27=5,4\left(g\right)\)

c, \(n_{HCl}=2n_{H_2}=0,6\left(mol\right)\)

\(\Rightarrow V_{ddHCl}=\dfrac{0,6}{2}=0,3\left(l\right)=300\left(ml\right)\)

Answer 2

\(n_{H_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\\a, 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{Al}=n_{AlCl_3}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\\ b,m=m_{Al}=0,2.27=5,4\left(g\right)\\ c,n_{HCl}=\dfrac{6}{3}.0,3=0,6\left(mol\right)\\ V=V_{ddHCl}=\dfrac{0,6}{2}=0,3\left(l\right)=300\left(ml\right)\)