Question

How many moles are there in 1.5 gram of sodium

Answer 1

no. of moles= given mass / molecular mass..
HERE given mass = 1.5 gm
molecular mass of Na 23
so. no. of moles = 1.5/23
= 0.0652 moles.....

hope you understand.

Answer 2

n=m/M
n=0.5/23
n=0.06521