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Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?

Tutor

100 gm of sodium will have (Given mass / molar mass )x Avogadro's Number = (100/23) x 6.022 x 10^23 = 2.62 x 10^24 atoms 100 gms of Iron will have (100/56) x 6.022 x 10^23 = 1.07 x 10^24 atoms So 100 gms of Sodium will have more atoms.

Science Power

Fe.

Tutor

100gram of sodium 100/23=4.34 moles I.e 4.34×6.023×10^23 100/56=1.78 moles I.e 1.78× 6.023×10^23

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Na. Since Atomic mass of Na<Fe the number of atoms for sodium will be much higher to make up 100gm. In fact ratio of no of atoms will be 56/23.

Teacher

100 gm of sodium will have (Given mass / molar mass )x Avogadro's Number = (100/23) x 6.022 x 10^23 = 2.62 x 10^24 atoms 100 gms of Iron will have (100/56) x 6.022 x 10^23 = 1.07 x 10^24 atoms So 100 gms of Sodium will have more atoms.

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