Answer:
the outermost layer called <em>Crust</em>
3. C- changed from liquid to gas
6. Rain
28 degrees below freezing would be 4 degrees
There are 1.204 x 10¹⁹ atoms O
<h3>Further explanation </h3>
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
1 mol of molecule Na₂C₂O₄ :
There are 4 mol of O in 1 mol of molecule Na₂C₂O₄
So for 5 x 10⁻⁶ mol Na₂C₂O₄ :

1 mole = 6.02.10²³ particles , so number of atoms O :

There isn't any molecules in plasma, hope this helps