Question

How many grams of AL are present in 0.2 mole of it???

Answer 1

1 mole of al = 6.022
$1 \: mole \: = 6.022 \times {10}^{23}$
and 1 mole = 27u
so 27gram or u
so 27 gram of al contains 1 mole so
1 gram of al atoms contains 1/5
0.2 mole of al atoms contains1/5×0.2
=1/25=0.04grams