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Earlier discussion
1 older comment kept for context.
Yakadi Abiti
Molar mass= (mass in g) ÷ (No. Of moles). 106g/mol = 10.6 g ÷ (No. of moles).
No. of moles = 0.1 mols
0.1 mols in 250 mls
X in 1000 mls (1 litre)
X = (0.1 mols × 1000 mls) ÷ 250 mls = 0.4
Hence concentration is 0.4 mol/dm3