Answer:

Step-by-step explanation:
Isocyanuric acid is C3H3N3O3. The "trichloro" means that there are also 3 Cl atoms attached. They likely replace the hydrogens, especially since the H's also form a single bond. So replace the 3 H's with 3 Cl's:
Isocyanuric Acid: C3H3N3O3
Trichlioroisocyanuric acid: C3Cl3N3O3
3C = 3*12 = 36
3Cl = 3*35.45 = 106.4
3N = 3*14 = 42
3O = 3*16 = 48
Total is 232.40 g/mole. This matches the provided molar mass figure of 232.41 g/mole.