有關MOLE的問題.....

first of all , you may consider one dozen of eggs. it means 12 eggs. right?

similarly, one mole of atom contains 6.02x10^23 atoms.

since the mass of an atom is very very small, we use carbon 12 as a

standard. so one mole of carbon 12 is 12 gram.

one mole of oxygen atoms is 16gram. but one mole of oxygen molecule

is 32 gram because one oxygen molecule contains two oxygen atoms.

0.5 mole of carbon atom is 12x 0.5 = 6gram.

is it not so difficult now?

hope this can help you