Calculate molality of a solution in which 4 g NaOH is dissolved in 500 g water.
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molality= no of moles/weight of solvent
molecular mass of NaOH=40 gm
no of moles=4/40
=0.1 moles
weight of solvent=500/1000
=0.5 kg
molality=0.1/0.5
=0.2 m
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