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12.044 x 10^23 atoms of oxygen contains _______(a) 1 mole of oxygen(b) 2 moles of oxygen(c) 3 moles of oxygen(d) 4 moles of oxygenThis question was posed to me in final exam.Origin of the question is Mole Concept and Molar Masses topic in chapter Chemistry Basic Concepts of Chemistry – Class 11

Answer»

The correct ANSWER is (b) 2 moles of OXYGEN

The explanation is: One mole of any substance contains Avogadro’s number of particles. Its VALUE is 6.022×10^23 atoms. But here it’s given 12.044 x 10^23 atoms, thereby dividing it by Avogadro’s number; 12.044 x 10^23 atoms/6.022×10^23 atoms = 2 moles. Hence it contains 2 moles of oxygen.



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