(a) If L is the Avogadro constant and E° is standard cell potential, state what X and Y stand for in the following expressions (i) X = \(\frac{\text{Mass of...

(a) If L is the Avogadro constant and E° is standard cell potential, state what X and Y stand for in the following expressions

(i) X = \(\frac{\text{Mass of L molecules of gas or vapour}}{\text{ Mass of L molecules of hydrogen}}\)

(ii) Y = -nFE°

(b) State two differences between a primary cell and a secondary cell.