Grams of Sodium hydroxide : 26.72 g
Further explanation
Molality shows the number of moles dissolved in every 1000 grams of solvent.
m = n. (1000 / p)
m = Molality
n = Number of moles of solute
p = Solvent mass (gram)
Can be written :
m=2.88
kg solvent(water)=232 g=0.232 kg

