Determine the number of moles of molecules (or formula units) in each sample.
(a) 38.2 g sodium chloride
(b) 36.5 g nitrogen monoxide
(c) 4.25 kg carbon dioxide
(d) 2.71 mg carbon tetrachloride
Here, we have to determine the number of moles of molecules which is also called as formula units in each sample :
A formula unit in chemistry is the empirical formula where an ionic compound in its simplest and most reduced terms. It is the simplest positive integer ratio of atoms present in a compound
Steps to find the number of moles:
1. Use the periodic table and get the molar mass of each element.
2. Divide the given mass of the sample by the molar mass of each element this gives the number of moles.