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Number of atoms in 558.5 g Fe (at. wt. 55.85) is:
  • a)
    Twice that in 60 g carbon
  • b)
    6.023 × 1022
  • c)
    Half in 8 g He
  • d)
    558.5 × 6.023 × 1023
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Number of atoms in 558.5 g Fe (at. wt. 55.85) is:a)Twice that in 60 g ...
Number of atoms in 558.5 g Fe (at. wt. 55.85) is twice that in 60 g carbon.

Calculation:

1. Calculate the number of moles of Fe:

Molar mass of Fe = 55.85 g/mol

Number of moles of Fe = Mass of Fe / Molar mass of Fe
= 558.5 / 55.85
= 10 mol

2. Calculate the number of atoms in 558.5 g of Fe:

Number of atoms of Fe = Number of moles of Fe x Avogadro's number
= 10 x 6.023 x 10^23
= 6.023 x 10^24 atoms

3. Calculate the number of atoms in 60 g of carbon:

Molar mass of C = 12 g/mol

Number of moles of C = Mass of C / Molar mass of C
= 60 / 12
= 5 mol

Number of atoms of C = Number of moles of C x Avogadro's number
= 5 x 6.023 x 10^23
= 3.012 x 10^24 atoms

4. Compare the number of atoms in Fe and C:

Number of atoms in Fe / Number of atoms in C
= (6.023 x 10^24) / (3.012 x 10^24)
= 2

Therefore, the number of atoms in 558.5 g Fe is twice that in 60 g carbon.
Free Test
Community Answer
Number of atoms in 558.5 g Fe (at. wt. 55.85) is:a)Twice that in 60 g ...
No. of atom of Fe = mole of Fe ※ avagadro no.
= 558.5/55.8 ※ Na
= 10 Na

now, atom of carbon = 60/12 ※ Na
= 5Na
after twice , we get 2※ 5Na
=10Na
so (a) is correct answer
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