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9 grade science> Which has more number of atoms, 100 grams...

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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)?

Pawan Prajapati , 4 Years ago

Grade 12

1 Answers

Harshit Singh

Last Activity: 4 Years ago

Dear Student

23 g of Na = 6.022 × 10^23 atoms (1 mole).
100 g of Na = ?
100 x 6.022 x 10^23= 602.2x 10^23
56 23
= 26.182 ×1023= 2.6182×10^24atoms
56 g of Fe = 6.022 × 10^23atoms
100 g o Fe = ?
100 g of Na contain → 2.618 × 10^24atoms
100 g of Fe contain → 1.075 × 10^24atoms
∴ 100 g of Na contains more atoms.

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