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Nature of Matter

2.38 g uraniu...

Question

2.38g uranium was heated strongly in a current of air. the resulting oxide weighted 2.806 g. determine the empirical formula of the oxide?

A) U4O8

B) U3O8

C) U9O5

D) U1O9

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Solution

Option (B)
No. of mol of U = 2.38 /238 = 0.01

No. of mol of O= (2.806-2.38)/16 = 0.426/16 =0.0266

Ratio of moles of U and O = 0.01 : 0.0266 =1: 2.66 = 3:8

So formula U(3)O(8)

Regards :D

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