120 grams #NaCl# is equal to how many molecules of #NaCl#?

1 Answer

Answer:

#1.24 * 10^24# formula units

Explanation:

#"NaCl"# is an ionic compound, so there are no molecules, only formula units.

#"1 mol of NaCl" = 6.02 * 10^23 " formula units"#

#"Formula units NaCl" = "120 g NaCl" * "1 mol NaCl"/"58.44 g NaCl" * (6.02 *10^23 " formula units")/"1 mol NaCl"#

#= 1.24 * 10^24 " formula units"#

Note: 58.44 g/mol is the molecular weight of #"NaCl"#