In any compound there are two types of ions are present, cations and anions. Cations are positively charged ions and formed by losing electrons and anions are formed by gaining electrons and are negatively charged ions.
So, in K₂HPO₄, there are positive charged and negative charged ions are present. so there is K⁺ ion and HPO₄⁻² ion is present in K₂HPO₄
Answer:
6.7 x 10²⁶molecules
Explanation:
Given parameters
Mass of CO₂ = 4.9kg = 4900g
Unknown:
Number of molecules = ?
Solution:
To find the number of molecules, we need to find the number of moles first.
Number of moles = 
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Number of moles =
= 111.36mole
A mole of substance is the quantity of substance that contains the avogadro's number of particles.
1 mole = 6.02 x 10²³molecules
111.36 moles = 111.36 x 6.02 x 10²³molecules = 6.7 x 10²⁶molecules
The answer is B hope it helped