Number of atoms in `558.5` ` g ` `Fe (at.wt.55.85)` is:

Options

A. twice that in 60 g carbon
B. `6.023 xx 10^(22)`
C. half life of 8g He
D. `558.6 xx 6.023 xx 10^(23)`

Answer

A

Explanation

No. of atoms of Fe `=(558.6)/55.86 xx 6.02 xx 10^(23)`
`=10 xx 6.02 xx 10^(23)`
No. of atoms in 60 g of C `=60/12 xx 6.022 xx 10^(23) = 5 xx 6.02 xx 10^(23)`
`therefore` No. of atoms in 558.6 g of Fe = twice the no. of atoms in 60 g of C.