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mol urea = (6 g) ÷ (60 g/mol) = 0,1 mol
molalitas = mol urea ÷ massa air (kg)
= (0,1 mol) ÷ (200/1000)
= (0,1 mol) × (1000/200)
= 0,1 × 5 = 0,5 molal