CH-892

Relative atomic and molecular mass

Chemistry · Secondary 3 · Medium · Relative atomic and molecular mass

Boron exists as two isotopes,

^{10}\text{B}

and

^{11}\text{B}

. In a sample, 30.0% of the atoms are

^{10}\text{B}

and 70.0% are

^{11}\text{B}

.

What is the relative atomic mass of boron in this sample?

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