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1dm3 --- 1220g --- 100%
xg --- 20%
x= 244 g
Mkoh = 56g/mol
244g --- x mol KOH
56 g --- 1 mol
x= 4,35 mol KOH --- 1000 cm3
y mol --- 300cm3
y = 1,3 mol KOH
zadanie 2
1,43g --- 1dm3
xg --- 2dm3 tlenu
x= 2,86g tlenu
mO2-- 1
mCu-- 4
2,86g--1
mCu --4
mCu= 11,44g