Question

Calculate the no of atoms in 15gm of ethane(c2h6)?

Answer 1

No. Of atoms= Given Mass X N•
———————
Total Mass
N• is Avogadro’s No.=6.022 X 10 raised to power23
No. Of atoms=2[c]+6[h]
=24+6
=30u
15/30 X 6.022 X 10 raised to power 23=
1/2 X 10.......
=3.011 X 10 raised to be power 23

Answer 2

u can check it in pradeep book of class 11th