Question

how to calculate molecular mass of an atom?how to calculate mol of a mass? ?

Answer 1

To calculate no. of moles of an element or an compound divide the given mass by the total mass of elements

for example find the no. of moles in 16 gram of O2

then we know that the mass of Oxygen is 16
and O2 means 2 atoms of oxygen

it means it's mass is 2*16=32
hence no. of moles
=16/32
=1/2 mole

I hope you have understood