Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

A. Both have the same molar mass.

B. Both have the same number of ions.

C. Both are made up of molecules.

D. Both are made up of formula units.

Answer – D. Both are made up of formula units.

The reason behind selection of the fourth option as the correct answer for the question is that the first option “A. Both have the same molar mass.” can be rejected as Aluminum Chloride has the molar mass of 133.34 g/mol and it is mainly made by using three atoms of chlorine and one atom of Aluminum. On the other hand, Sodium Chloride is also called table salt which has a molar mass of 58.44 g/mol and is developed by using one chlorine atom and one sodium atom. Both the compounds are developed by using the formula units and their molar masses are considered to be different. Molar mass of sodium chloride is 58.44g, 35.45g is the molar mass of chlorine and 22.99g is the molar mass of sodium. The reason behind rejection of the second option “B. Both have the same number of ions.” is that the both the compounds have different number of ions and the composition is also considered to be quite different. The reason behind the rejection of the option “C. Both are made up of molecules.” is that although molecules are present in both the compounds, the composition and molar mass is different and the impact of these molecules is also quite different. Hence, the most appropriate option for answering the question is the fourth option which is considered to be closest to the statement that has been provided with the answer. The answer is able to provide a clear picture based on the composition of the compounds and the differences that exist between them.