Question

How is 0.5 mole of NAOH different from 0.5M NAOH?

Answer 1

0.5 mole NaOH means :- 0.5 × 6.023 x 10²³ molecules present in this compound .

mole =weight /molecular wt
but 0.5 M means :- 0.5 mole of NaOH present in one litre of solution . this means strength of NaOH.

molarity = no of mole of solute /volume of solution (L)

Answer 2

Explanation:

We denote Molality with m and Molarity with M.

Where, Molality(m)=No. of moles of solute/Amount of solvent (in kg)

And Molarity(M)=No. of moles of soulte/Volume of solution(in Litres)

Therefore,

0.5m of NaOH means 0.5 moles of NaOH in 1 kg of solvent

And, 0.5 M of NaOH means 0.5 moles of NaOH in 1 Litre of Solution