Question

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

Answer 1

0.5 mole of NaOH
Meaning: There are 0.5 times avagadro number of molecules of NaOH

0.5 M NaOH
Meaning: 0.5 times avagadro number of molecules of NaOH are present in 1 litre of solution.

Answer 2

0.5 mole NaOH is equals to 6.022×10^22 molecules of NaOH and 0.5M NaoH is equal to Mass by Volume of NaOH or u can say molarity of NaOH