MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

If 1 12 moles of oxygen combine with Al to form Al₂O₃, the weight of Al used in the reaction is (Al = 27)

A.27 g

B.54 g✓ Correct

C.40.5 g

D.81 g

Explanation

Balanced chemical reaction is 2 2 3 3 2 2 Al O Al O → From the above reaction we know that, 2 Moles of Al combines with 3 1 . .1 2 2 i e moles of 2 O 1 mole of Al weights 27g 2 moles of Al will weigh = 2 27 54g x The correct option is (b)

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