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Chemistry urgent help needed with conversions and molar masses etc.!!!?

Question 2:

Al(s) + O2(g) Al2O3(s)

(a) Consider the unbalanced equation above. How many grams of O2 are compulsory to react with 15.0 g of aluminum? Use at least as many significant figures in your molar masses as in the data given.

______g O2

(b) What mass of Al2O3 is produced?

______g Al2O3

So the balanced equation is: 2 Al + 3 O2 --> 2 Al2O3
Is the answer:
a. 22.5
b. 1.41 x 10^3
????
Please help!!!