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

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

The density of NaOH solution is 1 . 2g cm ^ - 3 . The molality of...

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