\(n_K=\dfrac{3,9}{39}=0,1mol\)
\(2K+2H_2O\rightarrow2KOH+H_2\)
0,1 0,1 0,1 0,05 ( mol )
\(V_{H_2}=0,05.22,4=1,12l\)
\(C_{M_{KOH}}=\dfrac{0,1}{0,2}=0,5M\)
\(m_{H_2O}=0,1.18=1,8g\)
\(n_K=\dfrac{3,9}{39}=0,1\left(mol\right)\\
pthh:K+H_2O\rightarrow KOH+\dfrac{1}{2}H_2\)
0,1 0,1 0,1 0,05
\(V_{H_2}=0,05.22,4=1,12l\\
C_M=\dfrac{0,1}{0,2}=0,5\left(mol\right)\\
m_{H_2O}=0,1.18=1,8g\)