Jawabanmu

2014-08-23T01:21:30+07:00
Mr Urea = 60 g/mol
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