Question

the number of atoms in 140 grams of iron are

Answer 1

Hey friend ☺

☆ MOLE CONCEPT ☆

Atomic mass of iron = 56 u

No. of moles present in 140 g of Iron = 140/56

= 35/14

= 2.5

so 2.5 moles are present

we know Avogadro's number

so 1 mole of iron contains 6.022 × 10^23 atoms

so 2.5 moles contains

2.5 × 6.022 × 10^23

Hope it helps you

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