`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

From Avogadro.s law,
Avogadro.s number=Atomic mass of the element
`because 3.011xx10^(22)` atoms contain an element weigh 1.15 g
`because 6.023xx10^(23)` atoms contain an element weigh
`=(1.15xx6.023xx10^(23))/(3.011xx10^(22))=23`
Hence, atomic mass of the element is 23.