Molar mass is the mass of 1 mol of a compound
molar mass of a compound is the sum of the products of the molar masses of the individual elements by the number of atoms of the element
molar mass of Mn(ClO₃)₂ = molar mass of Mn + 2(molar mass of Cl + 3(molar mass of O))
Molar masses of the elements are
Mn - 55 g/mol
Cl - 35.5 g/mol
O - 16 g/mol
substituting the values
molar mass of Mn(ClO₃)₂ = 55 + 2 (35.5 + 3(16))
molar mass of Mn(ClO₃)₂ = 55 + 2 (35.5 + 48) = 55 + 2 (83.5) = 55 + 167 = 222
molar mass of Mn(ClO₃)₂ is 222 g/mol
