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A chemical compound is composed of atoms. The weight of each atom is known as the molecular mass. The molar mass of the compound is calculated by adding up the masses of all of the atoms and multiplying that number by the number of atoms in the compound. Molar mass is usually reported in grams per mole (g/mol).
The molar mass of a substance is a useful property for many reasons. It can be used to calculate the percentage of a particular atom in a given substance, or it can be used to determine the elemental composition of a compound. Molar mass is also a useful property for chemical reactions, as it can be used to determine the proper reactant ratios.
Metal sulfides, such as a-In2S3, have the potential to be effective catalysts for solar energy conversion. However, a-In2S3 typically crystallizes in two polymorphic forms, b-In2S3 and g-In2S3, with only b-In2S3 having a proper band gap for solar energy harvesting10,11. Moreover, a-In2S3 requires a large amount of energy to generate photons for solar energy conversion10.