Is the relative Formula mass for Aluminium Oxide simply :

Question

Al = 27 , O = 16

27+16 = 43?

Answer 1

No, the formula for aluminum oxide is Al2O3; therefore, formula mass is
(2*27) + (3*16) = ??

Answer 2

Incredibly wrong. It is compared to the carbon 12 ion, which should be obvious. Go back to school.