A 2.61 gram sample of a solid mixture contains NaClO3 as well as unreactive material. When heated, only the NaClO3 in the mixture decomposes to produce 992 milliliters of O2 gas at 225◦C and 772 mmHg according to the unbalanced equation NaClO3(s) −→ NaCl(s) + O2(g). What is the percent by mass of NaClO3 in the mixture?

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A: Pressure = 765 Torr Volume = 405 mL = 0.405 L Temperature = 25°C = 298 K  Mass of MnO2 required =?

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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.