Problem Ammonium carbonate is a white solid that decomposes with warming. It has many uses, for example, as a component in baking powder, fire extinguishers, and smelling salts.(a) How many formula units are in 41.6 g of ammonium carbonate?(b) How many O atoms are in this sample?Plan (a) We know the mass of compound (41.6 g) and need to find the number of formula units. we need the formula to find the amount (mol) and then multiply by Avogadro’s number to find the number of formula units. [The road map steps are for part (a).] (b) To find the number of O atoms, we multiply the number of formula units by the number of O atoms in one formula unit.

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.