The gram formula mass of KCl (potassium chloride) can be calculated by adding the atomic masses of its constituent elements: potassium (K) and chlorine (Cl).
Potassium has an atomic mass of approximately 39.1 g/mol, while chlorine has an atomic mass of about 35.5 g/mol. To find the total formula mass of KCl, you simply add these two values together:
Gram formula mass of KCl = Atomic mass of K + Atomic mass of Cl
Gram formula mass of KCl = 39.1 g/mol + 35.5 g/mol = 74.6 g/mol
Therefore, the gram formula mass of KCl is approximately 74.6 g/mol.