A sample of boron is found to contain a mixture of 20% and 80%

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

Problem

A sample of boron is found to contain a mixture of 20%

^{10}\text{B}

and 80%

^{11}\text{B}

. What is the relative atomic mass of boron in this sample? (1) 10.8 (2) 10.6 (3) 10.4 (4) 10.2