Given: Number of moles = 5

Atomic mass of AlBO₃ = 30+ 10.8 + 2 × 16 = 72.8g/mol

To find out the mass of aluminium borate, apply the formula given:

⇒

⇒ Mass = 5 mol × 72.8g/mol

⇒ Mass = 364g

Thus, the mass of aluminium borate is 364g.