Question

Dot chay hoan toan mot thanh nhôm trong khong khi. Sau phan ung thu dc 20,4 gam nhom oxit.

a) tinh khoi luong thanh nhom biet rang trong thanh nhom chua 15% tap chat trơ ko cháy

b) tinh the tich khong khi

Giup mik voi

Answer 1

\(4Al+3O_2\rightarrow2Al_2O_3\)

\(n_{Al_2O_3}=\frac{20,4}{102}=0,2mol\)

\(n_{Al\left(lt\right)}=2.n_{Al_2O_3}=2.0,2=0,4mol\)

\(m_{Al\left(lt\right)}=0,4.27=10,8g\)

\(m_{Al\left(tt\right)}-\frac{15}{100}.m_{Al\left(tt\right)}=10,8\)

\(\Rightarrow m_{Al\left(tt\right)}=\frac{216}{17}g\)

b) \(n_{O_2}=\frac{3}{2}.n_{Al_2O_3}=\frac{3}{2}.0,2=0,3mol\)

\(V_{O_2}=0,3.22,4=6,72l\)

\(V_{kk}=6,72.5=33,6l\)

Answer 2

Cai phan lua chon la mik ấn nhầm, ai giup mik di