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mola
mol/dm3
masa NaOH = 40g/mol
1mol NaOH --------- 40g
x mola NaOH ------ 4g
x = 0,1mola NaOH
w 0,2dm3 ------------- 0,1 mola
w 1dm3 ---------------- x
x = 0,5 mola >> stężenie molowe wynosi 0,5mol/dm3