Question

If 16 g of sodium hydroxide is dissolved in 250
ml of water. Find the molality of formed aqueous
solution. [density of water = 1g/mL ]
(1) 0.8
(2) 1.6
(3) 2
(4) 16​

Answer 1

Answer: 1.6

Explanation:mass given =16g mol.mass =40 g VOLUME =250ml or 250/1000L = 0.25L

Therefore MOLES =16/32=0.4

MOLARITY=MOLES ÷ VOLUME OF SOLUTION IN (LITRE)

MOLARITY= 0.4/0.25=1.6