Question

Question #96d44

Answer 1

In chemistry, a mole is a unit used for counting. A molecule is a single particle of a compound that has covalent bonding.

Let's consider water as an example.

One molecule of water is two hydrogen atoms bonded to an oxygen atom. H-O-H

1 mole of water is `6.022 x 10^23` molecules of water. One mole of water would have a mass of 18.02g. Because the density of water is 1g/mL, the mole of water would also have a volume of 18.02mL.

Note: I ask my students to calculate molar masses to two places beyond the decimal because we work with centrigram balances for our labs. Some chem teachers will ask their students to calculate molar masses to only one decimal, others to three or more.