The density of NaOH solution is $1.2 g c m^{- 3}$ . The molality of this solution is____ m. [use: Atomic masses: Na: 23.0u , O: 16.0u , H: 1.0u ; Density of H₂O: 1.0g cm^-3 ] (Round off to the nearest integer)

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answer is 5.

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Detailed Solution

(5) D = 1.2 g/cm³
Let V = 1000 ml
Mass of solution = 1.2 x 1000= 1200g
Mass of solute = 1200 – 1000= 200g
$n_{s o l u t e} = \frac{200}{4} = 5 M o l a r i t y = \frac{5}{1000} \times 1000$

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