Question

Please tell me what is that symbol NA in the equation

Answer 1

NA is the Avogadro's no which is equal to 6.022*10^23

Answer 2

NA is the Avogadro number i.e
$6.022 \times {10}^{23}$
it represent No of particle (atoms,electron,proton,neutron,ions etc) in one mole of any element