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1 + 5 = 6
6 - 100 %
1 - x
x = 16,67 %
2)
a)
6/2 = 3 mol/dm³
b)
masa molowa = 142 g/mol
142 - 1 mol
71 - x moli
x = 0,5 mola
c = 0,5/0,5 = 1 mol/dm³