`3.011 xx 10^(22)` atoms of an element weighs 1.15 g. The atomic mass of the element is

Options

A. 23
B. 10
C. 16
D. 35.5

Answer

(a)

Explanation

1 mole of a substance contains `6.023 xx 10^(23)` atoms.
`3.001 xx 10^(22)` - 1.15g
`6.023 xx 10^(23) - xg`
x = `6.023 xx 10^(23) xx 1.15/(3.001 xx 10^(22)) = 23g`
`:.` Atomic mass of the element is 23.