Answers

The Brainliest Answer!
2014-12-22T23:35:32+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Aluminium oxide is :  Al2 O3

Molecular mass = 102 units

in 102 grams we have  Na  = avogadro number of molecules  => 2 * Na atoms of Aluminum  or  2 * Al  ions.

 So  number of ions = 2 * 0.0519 / 102  * 6.0225 * 10^23
                       = 6.128 * 10^20
 


3 3 3
why its multiplied by 2
there are two aluminum atoms in one molecule. so there are two ions of Al per molecule of aluminum oxide.
ok so we dont need the atomic mass of al