Question

What is the mass of one mole of beryllium if the atomic mass of beryllium is 9.01?

Answer 1

`9.01" g"`.

Explanation:

A mole is defined as the amount of a substance whose mass in grams equals the atomic, molecular, or formula-unit mass in atomic mass units.

Example 1: Water (`"H"_2"O"`) has two hydrogen atoms and one oxygen atom per molecule. The two hydrogen atoms each have an atomic mass of `1.008`, the oxygen atom has an atomic mass of `15.999`, the sum for all three atoms is `18.015`. So a mole of water molecules has a mass of `18.015" g"`.

Example 2: Beryllium has an aromuc mass of `9.01`. So a mole of beryllium atoms has a mass of #9. 01" g"#.