The answer is 4.45 × 10²⁴ units.
To calculate this, we will use Avogadro's number which is the number of units (atoms, molecules) in 1 mole of substance:
6.02 × 10²³ units per 1 mole
So, we need a proportion:
If 6.02 × 10²³ units are in 1 mole, how many units will be in 7.40 moles:
6.02 × 10²³ units : 1 mole = x : 7.40 moles
After crossing the products:
1 mole * x = 7.40 moles * 6.02 × 10²³ units
x = 7.40 * 6.02 × 10²³ units
x = 44.5 × 10²³ units = 4.45× 10²⁴ unit
Answer:
Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus
Explanation: I hope this helps!!!!!
The subscript 2 indicates number of Cl atoms
<h3>Further explanation
</h3>
The molecular formula shows the number of atoms of a compound
whereas the empirical formula is the simplest comparison of the atoms making up the compound
MgCl₂ is an ionic compound composed of Mg and Cl atoms
Mg is in group 2 which has a +2 charge, while Cl is in the Halogen group which has a charge of -1
If the two are bonded, the 2 electrons released by Mg will be bound by 2 Cl atoms, each of which atoms of Cl need 1 more electron in order to obtain a stable electron configuration such as a noble gas
So the number 2 in the MgCl compound indicates the number of Cl atoms