Hydrogen peroxide (H2O2) decomposes in the presence of a catalyst to form water and oxygen gas.  The catalyst is added to 5.00 mL of a hydrogen peroxide solution at 25.0 °C, and 49.5 mL of gas is collected over water at a total pressure of 763.8 mmHg. Write and balance the chemical reaction.  Note: catalysts do not appear in balanced chemical equations. How many grams of hydrogen peroxide were in the original sample? What is the molarity of the original hydrogen peroxide solution?

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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.