\(n_K=\dfrac{3,8}{39}=\dfrac{19}{195}mol\)
\(n_{H_2O}=\dfrac{101,8}{18}=\dfrac{509}{90}mol\)
\(2K+2H_2O\rightarrow2KOH+H_2\)
19/195 < 509/90 ( mol )
19/195 19/195 19/195 ( mol )
Chất dư là H2O
\(m_{H_2O\left(dư\right)}=\left(\dfrac{509}{90}-\dfrac{19}{195}\right).18\approx100,04g\)
\(m_{KOH}=\dfrac{19}{195}.56\approx5,45g\)
Đúng 5
Bình luận (1)