$4K+O_2\rightarrow 2K_2O$$m_{K}=0,02 mol$$\rightarrow m_{K_2O}=0,5m_K=0,01 mol$$K_2O+H_2O\rightarrow 2KOH$$n_{KOH}=2n_{K_2O}=0,02 mol$$C_{M(KOH)}=\frac{n}{V}=\frac{0,02}{0,2}=0,1 (M)$
$4K+O_2\rightarrow 2K_2O$$m_{K}=0,02 mol$$\rightarrow m_{K_2O}=0,5m_K=0,01 mol$$K_2O+H_2O\rightarrow 2KOH+H_2$$n_{KOH}=2n_{K_2O}=0,02 mol$$C_{M(KOH)}=\frac{n}{V}=\frac{0,02}{0,2}=0,1 (M)$
$4K+O_2\rightarrow 2K_2O$$m_{K}=0,02 mol$$\rightarrow m_{K_2O}=0,5m_K=0,01 mol$$K_2O+H_2O\rightarrow 2KOH$$n_{KOH}=2n_{K_2O}=0,02 mol$$C_{M(KOH)}=\frac{n}{V}=\frac{0,02}{0,2}=0,1 (M)$