The density of NaOH solution is 1 . 2 g cm - 3 . The molality of this solution is m (Round off to the Nearest Integer): [Use : Atomic masses : Na : 23 . 0 u O : 16 . 0 u H : 1 . 0 u Density of H 2 O :

Question

The density of NaOH solution is 1 . 2 g cm - 3 . The molality of this solution is m (Round off to the Nearest Integer): [Use : Atomic masses : Na : 23 . 0 u O : 16 . 0 u H : 1 . 0 u Density of H 2 O : 1 . 0 g cm - 3

TestHub · Accepted Answer

Consider 1 ℓ solution mass of solution = ( 1 . 2 × 1000 ) g = 1200 gm Neglecting volume of NaOH Mass of water = 1000 gm ⇒ Mass of NaOH = ( 1200 - 1000 ) gm = 200 gm ⇒ Moles of NaOH = 200 g 40 g / mol = 5 mol ⇒ molality = 5 mol 1 kg = 5 m

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