1 mole K ------------- 6.02x10²³ atoms
1.83 moles K ------ ?? atoms
1.83 x (6.02x10²³) / 1 =
1.101x10²⁴ atoms of K
hope this helps!
Reaction:

Magnesium is a stronger reducing agent than copper and is thus able to reduce copper(II) oxide.
Products of the reaction: Magnesium oxide and metallic copper.
The fifth shell can hold up to 50 electrons and the forth shell can hold 8 electrons
The differing heart rates is the dependent variable. This is because it is dependent on the exercise that will depict the heart rate