chemistry question?

Question

Calculate the weight of 2.27 moles of Al2O3?

Express your answer in grams of aluminum oxide as three significant digits.

WARNING: Only provide the numerical answer. Do not include the units in the answer box. If you fail to enter your answer in the correct form, it will be counted wrong.

Answer 1

To first order, just sum up the atomic weights of the constituents:

(2.27)((2)(atomic weight of Al) + (3)(atomic weight of O))

http://en.wikipedia.org/wiki/Molar_mass

For the atomic weights, check out:
http://www.chem.qmul.ac.uk/iupac/AtWt/