Isotopes are composed of the same atoms but are arranged differently
Answer:
Tell him u like him and be respect his idea of what he say it’s a 50/50 chance he likes u. I really believe u can do it.
Explanation:
Here is some different pics of a water table. I hope this is what you are looking for :). You can click the pictures to in large them.
It would be A, the molecules should be closely packed together but arranged randomly. :)
First a balanced reaction equation must be established:

→

Now if mass of aluminum = 145 g
the moles of aluminum = (MASS) ÷ (MOLAR MASS) = 145 g ÷ 30 g/mol
= 4.83 mols
Now the mole ratio of Al : O₂ based on the equation is 4 : 3
[
4Al +
3 O₂ → 2 Al₂O₃]
∴ if moles of Al = 4.83 moles
then moles of O₂ = (4.83 mol ÷ 4) × 3
=
3.63 mol (to 2 sig. fig.)
Thus it can be concluded that
3.63 moles of oxygen is needed to react completely with 145 g of aluminum.