To determine formula weight of a molecule we will need to atomic mass of each element and sum them all to form the molar mass:
TiClO4 is the formula for titanic hypochlorite, therefore we have:
Ti = 47.86 grams
ClO^- = 51.45 grams
4 ClO^- = 205.8 grams
Now adding all the mass in the formula we will end up with:
TiClO4 = 253.66 g/mol
