Jawapan

2016-05-30T20:06:46+08:00
First of all you need to know the formula so the formula is no.of mole multiply with avogardo no. which is 6.02 times 10 power of 23...it's actually based on question whether it is 6.0 or 6.02 ...
2016-06-03T20:18:42+08:00
0.2 x 6.02 x 10 ^23 x 3 =3.612 x 10^23
0.5 x 6.02 x 10^23 x 3 =9.03 x 10^23

i think so this is the answer