Ammonia and hydrogen chloride react to form solidammonium chloride:NH31g2 + HCl1g2¡NH4Cl1s2Two 2.00-L flasks at 25 °C are connected by a valve,as shown in the drawing. One flask contains 5.00 gof NH31g2, and the other contains 5.00 g of HCl(g). Whenthe valve is opened, the gases react until one is completelyconsumed. (a) Which gas will remain in the system afterthe reaction is complete? (b) What will be the final pressureof the system after the reaction is complete? (Neglectthe volume of the ammonium chloride formed.) (c) Whatmass of ammonium chloride will be formed?

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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.