Mass of one atom of an element is `6.66xx10^(-23)` g. How many moles of element are there in 0.320 kg?

Explanation

Mass of one atom of an element = `6.66xx10^(-23)` g
No. of moles =`("Mass")/("Molecular mass")`
Molecular mass = Mass of 1 atom `xx` Avogadro number
= `6.66xx10 ^(-23)xx 6.023xx10^(23) `
= 6.66`xx`6.023 =40.11318
Number of moles = `("Mass")/("Molecular mass") = (0.320 kgxx10^(3))/40`
= `720/180 `= 8 moles