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mKOH=56u
mH2=2u
2K + 2H2O---->2KOH + H2
78g K -----112g KOH
15,6g K -----xg KOH
x = 22,4g KOH
2K + 2H2O---->2KOH + H2
78g K -----2g H2
15,6g K ----xg H2
x = 0,4g H2
22,4g KOH ------199,6g roztworu(15,6g K + 184,4g H2O - 0,4g H2)
xg KOH ---------- 100g roztworu
x = 11,22g KOH
x = 11,22%