Boron consists of two stable isotopes, B-10 ( ) and B-11 ( )

CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure

Problem

Boron consists of two stable isotopes, B-10 (

10.01\,\text{amu}

) and B-11 (

11.01\,\text{amu}

). The average atomic mass of boron is

10.81\,\text{amu}

. Which ratio of the number of B-10 atoms to B-11 atoms in a typical natural sample is closest to the true value? (a)

1:3

(b)

1:4

(c)

4:1

(d)

1:2