Dear friend
They are telling us that mole is amount of a substance in any any element.
GRAM ATOM = MASS IN GRAM OF ELEMENT
RELATIVE ATOMIC MASS
MASS IN GRAM OF ELEMENT means that the amount you are give to calculate e.g. 11grams of hydrogen . 11 grams is mass in grams of element.
RELATIVE ATOMIC MASS means the atomic mass of a element
E.g. atomic mass of hydrogen is 1.
Mole mass is calculated by this method.
Regards
Sidhu moosewala ki jai.
