Number of atom in one mole = 6.022 × 10²³
So, in 3.5 moles, it would be: = 6.022 × 10²³ * 3.5 = 2.1 × 10²⁴
In short, Your Answer would be 2.1 × 10²⁴ atoms
Hope this helps!
Melting? not really sure what type of answer they are going for but the substance is going through the melting phase
It's a single- replacement reaction so Mg+ 2HCl ➡️ H2+ MgCl2
By sharing valence electrons between the two atoms
Africa, South America, Antarctica, Australia, and the subcontinent of India would be the answer…
