HARDMCQ SINGLEJEE Mains ChemistryPhysical ChemistryMole _ Equivalent ConceptAchiever Section

Number of atoms in 560g of Fe (atomic mass 56 g mol–1) is

A.twice that of 70 g N₂

B.half that of 20 g H₂

C.Both (a) and (b)✓ Correct

D.None of the above

Explanation

Let N be Avogadro’s number. The atomic/molar masses of Fe, N₂ and H₂ are 56 g/mol, 28 g/mol and 2 g/mol respectively. MOLE & EQUIVALENT CONCEPT 64 560 560 10 mol 10 atoms. 56 / g g Fe Fe N g mol 2 2 70 70 2.5 moles 28 / m 2 2.5 5 atoms. g g N g ol N N x Twice of this corresponds to 2 5 10 . N N x 20g of 2 20 10 mole 2 / g H g mol 2 2 10 20 H N N x atoms. Hence, option (c) both (a) and (b) are correct option

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