Write balanced chemical equations corresponding to each ofthe following descriptions: (a) Solid calcium carbide, CaC2,reacts with water to form an aqueous solution of calcium hydroxideand acetylene gas, C2H2. (b) When solid potassiumchlorate is heated, it decomposes to form solid potassiumchloride and oxygen gas. (c) Solid zinc metal reacts with sulfuric acid to form hydrogen gas and an aqueous solution ofzinc sulfate. (d) When liquid phosphorus trichloride is added towater, it reacts to form aqueous phosphorous acid, H3PO3(aq),and aqueous hydrochloric acid. (e) When hydrogen sulfide gasis passed over solid hot iron(III) hydroxide, the resulting reactionproduces solid iron(III) sulfide and gaseous water.

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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.