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Question:

Aluminum oxide questions?

To the nearest gram, what is the molar mass of aluminum oxide?How many moles are present in 408 grams of aluminum oxide?How many molecules are present in 408 grams of aluminum oxide?

Answer:

aluminium(III) oxide is Al2O3 molar mass is 2xAl + 3XO = (2 x 27) + (3 x 16) = 102g/mol n(Al2O3) = 408/102 = 4 mol Aluminium oxide isn't molecular, so your last question doesn't make any sense. It is a giant ionic structure where the primitive cell contains two formula units of aluminium oxide (in other words the basic unit is Al4O6). So the number of primitive cells will be (4 x 6.02x10^23)/2 ie 1.204x10^24

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