Question

define the following terms 1.A mole of a species 2.gram atomic mass

Answer 1

mole is not anything but it us just a number. Like we say 1 dozen contains 12 number of anything . Similarly 1 mole of a things contains 6.022*10^23 things in it

Answer 2

one mole of a body is defined as the fixed number of atom, molecules, particles, ions (6.22 into 10 to the power 23 ) present in pure substance is equal to its atomic mass