Calculate the Formula Unit Mass of CACL2.

The formula of calcium chloride – CaCl₂

It contains one calcium and two chlorine atoms.

Relative atomic mass of Ca = 40.08

Relative atomic mass of Cl = 35.45

Formula mass of CaCl₂ = [(1 Ca) + (2Cl)]amu

= [ ( 1 40.08) + ( 2 35.45)]amu

= (40.08 + 70.9) amu

= 110.98 amu

= 111 amu

Therefore, the formula mass of CaCl₂ is 111 amu.