Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is:

Answers (1)

 Number of moles of Fe atom \mathrm{=\frac{558.5}{55.85}=10\ mole}

Total number of atom =10\times 6.022\times 10^{23}=6.022 \times10^{24}

12 g of carbon means Avogadro's number,

Therefore, 60 g of carbon means 5 moles of carbon

Thus contains 5XNatoms, twice of this equals 10Natoms of carbon.

Total number of atom =10\times 6.022\times 10^{23}=6.022 \times10^{24}

6.022 \times10^{24} no. of atoms found in twice that in 60 g carbon.

Ans. Option (1)


Option 1)

twice that in 60 g carbon

This is correct option.

Option 2)

6.023 × 1022

This is an incorrect option.

Option 3)

half that in 8 g He

This is an incorrect option.

Option 4)

558.5 × 6.023 × 1023

This is an incorrect option.

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